Proctoscopy--a routine procedure. An experiment in updating proctoscopic techniques.
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An evaluation of procedures used in staging carcinoma of the cervix.
A review of 227 cases of invasive carcinoma of the cervix was undertaken to determine the efficacy of procedures using in the staging of this disease. All patients had a pretreatment chest radiography and intravenous pyelogram. 96.5% had pretreatment cystoscopy, 98.6% had pretreatment proctoscopy, and 92% had a pretreatment barium enema. These patients were retrospectively staged on the findings of physical examination only. Each additional procedure was then evaluated by comparison with the initial staging. Cystoscopy and chest film findings each would have changed the clinical stage in fewer than 1% of cases, barium enema in 1.4%, and proctoscopy in 2.2%. No patient had a positive barium enema without a positive proctoscopy, while two patients had positive proctoscopies with negative barium enemas. The overall yield of positive findings by pretreatment intravenous pyelography was 7.3%. Lymphangiography, although inconsistently done, yielded positive findings in all stages. Chest radiographs, intravenous pyelography, proctoscopy, and lymphangiography are recommended as part of the pretreatment workup of patients with carcinoma of the cervix. Routine barium enema is no longer recommended, and cystoscopy is only recommended in patients with clinical stage IIB disease or greater.
Barium Sulfate↗
A pilot study of topical intrarectal application of amifostine for prevention of late radiation rectal injury.
PURPOSE: Clinical symptomatic late injury to the rectal wall occurs in about one-third of patients with prostate cancer treated with external beam irradiation. Reducing the physical dose to the anterior rectal wall without a similar reduction in the posterior peripheral zone is difficult because of the proximity of the prostate to the anterior rectal wall. On the basis of our previous observations in an animal model that intrarectal application of amifostine resulted in very high concentrations of amifostine and its active metabolite WR-1065 in the rectal wall, a Phase I dose-escalation clinical trial was undertaken. METHODS AND MATERIALS: Twenty-nine patients with localized prostate cancer were accrued. Eligibility criteria included histologically confirmed adenocarcinoma, Karnofsky performance status >or=70, and no pelvic lymphadenopathy or distant metastases. The total dose to the prostate was 70.2 Gy in 20 patients and 73.8 Gy in 9 patients. Therapy was delivered using a 4-field technique with three-dimensional conformal planning. Amifostine was administered intrarectally as an aqueous solution 30 min before irradiation on the first 15 days of therapy. Amifostine was escalated in cohorts from 500 to 2500 mg. Proctoscopy was performed before therapy and at 9 months after completion. Most patients underwent repeat proctoscopy at 18 months. On Days 1 and 10 of radiotherapy, serum samples were collected for pharmacokinetic studies. The clinical symptoms (Radiation Therapy Oncology Group scale) and a proctoscopy score were assessed during follow-up. RESULTS: All patients completed therapy with no amifostine-related toxicity at any dose level. The application was feasible and well tolerated. No substantial systemic absorption occurred. With a median follow-up of 26 months, 9 patients (33%) developed rectal bleeding (8 Grade 1, 1 Grade 2). At 9 months, 16 and 3 patients developed Grade 1 and Grade 2 telangiectasia, respectively. This was mostly confined to the anterior rectal wall. No visible mucosal edema, ulcerations, or strictures were noted. No significant differences were found between the proctoscopy findings at 9 and 18 months. Four patients (14%) developed symptoms suggestive of radiation damage that, on sigmoidoscopy, proved to be secondary to unrelated processes. These included preexisting nonspecific proctitis (n = 1), diverticular disease of the sigmoid colon (n = 1), rectal polyp (n = 1), and ulcerative colitis (n = 1). Symptoms developed significantly more often in patients receiving 500-1000 mg than in patients receiving 1500-2500 mg amifostine (7 [50%] of 14 vs. 2 [15%] of 13, p = 0.0325, one-sided chi-square test). CONCLUSION: Intrarectal application of amifostine is feasible and well tolerated. Systemic absorption of amifostine and its metabolites is negligible, and close monitoring of patients is not required with rectal administration. Proctoscopy is superior to symptom score as a method of assessing radiation damage of the rectal wall. The preliminary efficacy data are encouraging, and further clinical studies are warranted.
Adenocarcinoma↗
Is Hartmann's procedure safe in Crohn's disease? Report of three cases.
INTRODUCTION: Crohn's disease-associated colorectal cancer may occur in an area of defunctioning bowel. Some patients with Crohn's colitis undergo subtotal colectomy, ileostomy, and low Hartmann's procedure in an effort to preserve the rectum. This procedure has also been advocated for patients with severe anorectal Crohn's disease, in whom nonhealing of the perineal wound after proctectomy occurs with alarming frequency. The authors present a review of the literature and three cases of cancer developing in the defunctioning rectal stump despite surveillance proctoscopy. METHODS: Twenty-five patients underwent low Hartmann's procedure for severe anorectal Crohn's disease. Surveillance proctoscopy was performed as follow-up. Development of cancer in the rectal remnant or anus or recurrence of symptoms was managed by resection and adjuvant therapy. RESULTS: One patient developed squamous-cell carcinoma of the anal canal, underwent resection and adjuvant therapy, and was disease free at the time of this study. Two patients developed adenocarcinoma of the rectum. Both underwent resection and adjuvant therapy. One patient died and the other developed a recurrence. CONCLUSIONS: The authors recommend interval perineal proctectomy in all patients undergoing low Hartmann's procedure for severe anorectal Crohn's disease in whom rectal preservation is not possible. Regularly scheduled interim surveillance proctoscopy performed every two years, with biopsies of macroscopically normal-appearing and abnormal-appearing rectal mucosa and curetting of fistulous tracts, is also recommended to decrease the possibility of missing occult malignancies.
Adult↗
Is fecal diversion necessary for nondestructive penetrating extraperitoneal rectal injuries?
BACKGROUND: Current management of penetrating extraperitoneal rectal injury includes diversion of the fecal stream. The purpose of this study is to assess whether nondestructive penetrating extraperitoneal rectal injuries can be managed successfully without diversion of the fecal stream. METHODS: This study was performed at an urban Level I trauma center during a 28-month period from February 2003 through June 2005. All patients who suffered nondestructive penetrating extraperitoneal rectal injuries were managed with a diagnosis and treatment protocol that excluded fecal stream diversion. Patients were placed in one of two management arms based upon clinical suspicion for intraperitoneal injury. In the first arm, patients with suspicion for rectal injury and a positive clinical examination for intraperitoneal injuries were delivered to the operating room for exploratory laparotomy. Proctoscopy was performed before exploratory laparotomy. Extraperitoneal rectal injuries were left to heal by secondary intention. Intraperitoneal rectal injuries were repaired primarily. Patients did not receive fecal diversion or perineal drainage. In the second management arm, patients with a negative clinical examination for intraperitoneal injury and wounding agent trajectory suspicious for rectal injury underwent diagnostic peritoneal lavage (DPL), cystography, and proctoscopy in the emergency room. Positive DPL or cystography warranted laparotomy as above. Patients with positive proctoscopy alone were admitted and placed on a clear liquid diet. Barium enema was performed 5 to 7 days postinjury for all rectal injuries with diets advanced accordingly.A matched historic control group of rectal injury patients who underwent fecal diversion was compared with the nondiversion protocol group. Patients from both groups were matched for penetrating abdominal trauma index (PATI), age and mechanism of injury. RESULTS: There were 14 consecutive patients diagnosed with penetrating rectal injury placed in the nondiversion management protocol. Of these, 9 (64%) patients in the nondiversion group required laparotomy. The average age in the diversion historical control group was 30.5 years and 29.3 years in the nondiversion group. The average PATI in the diversion group was 15.3 and 16.1 in the nondiversion protocol group. The average length of stay for the diversion and nondiversion groups was 9.8 days (range, 7-15) and 7.2 days (range, 4-10), respectively. There were no complications associated with rectal injuries in either group. CONCLUSIONS: Nondestructive penetrating rectal injuries can be managed successfully without fecal diversion. Randomized prospective study will be necessary to assess this management method.
Abdominal Injuries↗
Reinterventions after complicated or failed stapled hemorrhoidopexy.
BACKGROUND: Stapled hemorrhoidopexy has become increasingly popular over the past five years, mainly because of the assumption that it is associated with less pain. However, persistent tags and recurrence might represent a problem, because piles are not excised and severe complications requiring surgery have been occasionally reported. The aim of the present study is to analyze the causes for and the outcome of reintervention following either severely complicated or failed stapled hemorrhoidopexy. METHODS: A total of 232 primary stapled hemorrhoidopexies and 65 reinterventions after stapled hemorrhoidopexy were performed by the authors in five centers devoted to colorectal surgery. Twelve patients of the latter group had the stapled hemorrhoidopexy performed in one of these centers. Thirty-five were males and 30 were females. The mean age was 50 (range, 29-81) years. In all cases the primary indication for stapled hemorrhoidopexy was either third-degree or fourth-degree symptomatic hemorrhoids. In all patients submitted to reoperation the diagnosis of either severely complicated or failed stapled hemorrhoidopexy was made. The clinical history of all of these patients was carefully studied and all underwent inspection, digital exploration, and proctoscopy. After the reintervention, proctoscopy was performed in 61 patients (92 percent) after a median follow-up of 5.5 (range, 1-36) months. RESULTS: Our reoperation rate after stapled hemorrhoidopexy was 11 percent. The most frequent indications for reintervention were persistent, severe anal pain (visual analog pain score higher than 7) in 29 patients (45 percent), severe postoperative bleeding in 20 (31 percent), anal fissure in 16 (21 percent), prolapsing piles in 12 (18 percent), rectal polyp in 11 (16 percent), anorectal sepsis in 11 (16 percent), and fecal incontinence in 7 (11 percent). Thirteen different types of reintervention were needed. Excisional hemorrhoidectomy, removal of staples, and fissurectomy and/or internal sphincterotomy were the most frequent operation (n = 41). A decrease in anal pain, as measured by visual analog pain score, was observed one month after reintervention, compared with that measured preoperatively (from 5.6 +/- 3.6 to 3.0 +/- 2.9) (P < 0.001). Bleeding requiring treatment occurred in six cases (10 percent), anal stricture requiring dilation occurred in three (5 percent), and fecal incontinence in three (5 percent). Proctoscopy showed no recurrences in 52 cases (80 percent) after the reintervention. CONCLUSION: Pain and bleeding mostly caused by piles, fissures, and retained staples were the most frequent causes for reoperation after stapled hemorrhoidopexy. Reintervention was associated with a high bleeding and soiling rate, but was effective in treating pain and other symptoms in the majority of patients. Because of the wide spectrum of different interventions required, a failed or complicated stapled hemorrhoidopexy might be better treated by an experienced colorectal surgeon.
Adult↗
Assessing the predictive value of clinical complete response to neoadjuvant therapy for rectal cancer: an analysis of 488 patients.
BACKGROUND: Patients with transmural or node-positive rectal cancer benefit from the addition of chemoradiation to surgical resection. Administration of the chemoradiation (combined modality therapy) preoperatively has gained popularity in recent years. Some patients undergo apparent complete tumor regression after preoperative combined modality therapy, and controversy exists about the proper management of these patients. Some investigators have proposed that such patients should simply be observed and not undergo resection. STUDY DESIGN: The purpose of this study was to determine the significance of clinical complete response to preoperative combined modality therapy. Specifically, we have attempted to determine the frequency with which a clinical complete response (based on the absence of detectable tumor on preoperative digital rectal examination and proctoscopy) correlates with a pathologic complete response (based on the absence of cancer cells in the resected specimen). A retrospective review of the clinical and pathologic characteristics of 488 patients from the Memorial Sloan-Kettering prospective colorectal database who received preoperative chemoradiation followed by resection for primary rectal cancer was performed. The indications for preoperative therapy included clinical or ultrasound T3 or T4 tumors or node-positive disease. RESULTS: The clinical complete response rate to preoperative therapy was 19%. All patients underwent resection subsequent to preoperative therapy regardless of response. The pathologic complete response rate among all patients was 10%. The pathologic complete response rate among clinical complete responders was 25%. Clinical complete response was a significant predictive factor for pathologic complete response, but the majority (75%) of clinical complete responders had persistent foci of tumor that were not detectable on preoperative examination or proctoscopy. CONCLUSIONS: Clinical complete response to preoperative therapy as determined by preoperative digital rectal examination and proctoscopy or EUA is not an accurate predictor of pathologic complete response. A significant percentage of clinical complete responders have persistent deep tumors or nodal involvement. We do not recommend making treatment decisions based solely on the absence of clinically palpable or visible tumor after chemoradiation. Our data suggest that all acceptable-risk patients with a diagnosis of primary rectal cancer should undergo resection, regardless of their response to preoperative therapy.
Adult↗
The fluoroscopic barium enema in colonic polyp detection.
The results of 1,500 barium enema studies done by vigorous manual palpation under fluoroscopy were reviewed to determine the adequacy of this technique in detecting polyps above the proctoscopic level. Of the 1,500 patients examined, 103 (7%) were diagnosed radiographically as having a total of 149 polyps. Polyps were found at proctoscopy in about 10% of the 1,500 patients. Colonoscopy or surgery was performed on 35 of the 103 patients. Of the 52 polyps discovered during these procedures, only three were missed at fluoroscopic barium enema study, a false-negative rate of 6%. Fourteen patients whose barium enemas initially were reported as negative for polyps or neoplasia had colonoscopy. Two of the 14 patients had positive findings, for a true-negative rate of 86%. If the detection rate of 7% found at barium enema, taking into account an overlap of 10%, is combined with the rate of 7.5% found at proctoscopy, a frequency of about 14% emerges in detecting polyps in the rectum and in the colon. Thus, the fluoroscopic barium enema when combined with proctoscopy is a sensitive method in the detection of colorectal polyps. In addition, it has the advantage of rapid execution and relatively low cost.
Barium Sulfate↗
Early detection of nonpolypoid cancers in the rectal remnant in patients with familial adenomatous polyposis/Gardner's syndrome.
BACKGROUND: Invasive cancer occurs in the rectal remnant of patients with familial adenomatous polyposis (FAP). METHODS: A long term surveillance proctoscopy program was performed on 25 patients with an established diagnosis of FAP or Gardner's syndrome. RESULTS: The surveillance revealed small nonpolypoid cancer of the rectal remnant in two patients. One cancer, which measured 5 mm, was restricted to the mucosa, whereas the other, measuring 10 mm at its greatest dimension had invaded the submucosa. On proctoscopy, both the lesions were characterized by a reddish depression, surrounded by marginal elevations. Both of these cancers were composed of well differentiated adenocarcinoma without any adenomatous component. CONCLUSIONS: The authors' experience suggests that nonpolypoid cancers do exist in FAP/Gardner's syndrome and that careful follow-up seems necessary in patients with a diagnosis, especially in consideration of the possible development of nonpolypoid lesions.
Adenocarcinoma↗
Are people being screened for colorectal cancer as recommended? Results from the National Health Interview Survey.
BACKGROUND: The evidence is now compelling that colorectal cancer incidence and mortality can be reduced by screening, and medical organizations recommend regular screening among persons of average risk aged 50 years or older. We sought to determine whether appropriate screening has become more widespread now that consensus over its value has been achieved. METHODS: We analyzed data from the 1992 and 1998 National Health Interview Survey, an in-person survey of a nationally representative sample of the U.S. population. Persons aged > or =50 years (4428 in 1992, 12,629 in 1998) were questioned about their use of colorectal cancer screening. RESULTS: Self-reported use of fecal occult blood testing and proctoscopy increased slightly from 1992 to 1998. In 1998, however, only an estimated 22.9% of Americans aged > or =50 years had been screened with either the home-administered fecal occult blood testing in the past year or proctoscopy within 5 years. Nearly half of fecal occult blood testings were performed with a sample taken during an in-office physical examination rather than with the recommended home kit. CONCLUSION: Most eligible persons are still not meeting the screening recommendations for colorectal cancer. Education is needed for both the public and health care providers to increase their compliance with current guidelines.
Aged↗
Comparative studies on the usefulness of phosphate versus glycerin enema in preparation for colon examinations.
Fifty of 100 persons who had undergone health screening received phosphate enema while the other 50 received glycerin enema prior to proctoscopy and barium enema, and their usefulness for preparation for colon examination was compared by a double-blind test. There was no significant difference in the degree of colonic cleansing achieved by proctoscopy and barium enema. In the subjects who received phosphate enema, the incidence of abdominal pain was less than that in those who received glycerin enema, while the effect of phosphate enema on defecation appeared later than that of glycerin enema, indicating prolonged stool retention in the subjects given phosphate enema. To study the safety of the two enemas, either phosphate enema, glycerin enema or physiological saline solution as a control was administered at 0.35 ml/animal in the rectum by 4-h closure of the anus in 10 male 7-week-old Wistar rats, and the rectal mucosa was observed for irritation macroscopically and histopathologically. Glycerin enema produced less irritation than phosphate enema diffusely in the entire area of the rectum, while phosphate enema produced more local irritation at the end of the rectum than glycerin enema. The differences in the extent of irritation and injury between phosphate and glycerin enemas were considered to be derived from differences in the pharmacologic actions of these drugs. If the extent of injury were included in the extent of irritation, the difference in irritation between phosphate and glycerin enemas would not be significant. As described above, no specific difference seem to exist in the usefulness of phosphate and glycerin enemas as preparation for colon examination.
Animals↗
Knowledge of colorectal cancer and use of screening tests in persons 40-74 years of age.
Telephone surveys were conducted in 1988 on random samples of persons ages 40-74 years in two populations with relatively high rates of colorectal cancer, i.e., in Long Island (NY) and in Connecticut. Correct responses to questions concerning warning signs for and the frequency of colorectal cancer relative to stomach cancer were not related to age but were positively associated with educational level and were greater among females than males. Awareness of the possible role of dietary factors in cancer (i.e., regarding both cured meat and fiber-rich foods) was high, while daily consumption of bran cereals was infrequent. Proportions of respondents who reported having colorectal screening tests increased with age and were higher among college graduates and among those having annual medical check-ups (especially for college graduates). In multivariate analyses age (i.e., 60-74 vs 40-59 years) and education (i.e., college graduates vs all others), along with frequency of medical check-ups, were significant independent predictors of use of colorectal screening tests (both fecal occult blood and proctoscopy), while gender (female) was negatively associated with proctoscopy. Implications for planning intervention programs are discussed.
Adult↗
Location of pelvic recurrence after 'curative' low anterior resection for rectal cancer.
AIMS: It has been emphasized that the mesorectum is the key to local recurrence after resection for rectal cancer. In view of this we studied the location of recurrences, relative to the bed of the primary tumour, the neorectum and the level of anastomoses, in patients referred for recurrences after low anterior resection (LAR) in the < >. METHODS: The relative level above the anal verge of the primary cancer, the anastomosis and the recurrence was registered by proctoscopy in 46 patients operated on for recurrent cancer after low anterior resection. The origin of the recurrence was determined from the operative specimen. RESULTS: The median level of the primary cancers was 10 cm above the anal verge, with the anastomoses 2 cm lower, the majority being within 2 cm. Most recurrences were within 1 cm of the anastomosis. No rectal cancer occurred more than 3 cm distal to the anastomosis. Seventy to 80% of recurrences started peri-rectally, most invading the anastomosis. CONCLUSIONS: The tumour bed is most often the origin of the recurrence. Recurrences were mostly due to inadequate radial, and in a few cases longitudinal, dissection of the mesorectum. Virtually all recurrences were within reach of the examining finger. At follow-up of rectal cancers most local recurrences can therefore be identified earlier by digital examination than by proctoscopy.
Adult↗
Ulcerative and granulomatous colitis in children. Comparison of double- and single-contrast studies.
The authors reviewed 49 double-contrast and 27 single-contrast barium-enema examinations (BE) in 71 children with suspected inflammatory bowel disease. The diagnosis was proved in 41 patients, of whom 36 underwent proctoscopy and 5 had advanced disease which was treated surgically within 3 to 30 days after BE; the other 30 children served as controls. BE and proctoscopy were compared with regard to sensitivity (detection of disease) and accuracy (categorization as ulcerative or granulomatous colitis). Sensitivity was 93% for double-contrast and 82% for single-contrast BE. Both detected all cases of advanced disease; in early disease, double-contrast BE detected 91% of cases and single-contrast BE 70%. Colitis was correctly categorized as ulcerative or granulomatous in 93% with double-contrast BE and 86% with single-contrast BE. Specificity within the control group was 100% with both techniques. The authors conclude that both types of BE exhibit similar sensitivity in advanced disease, but the double-contrast technique is more accurate in detecting early disease.
Adolescent↗
Intraluminal implantation of rectal carcinoma successfully resected by endoscopy.
A 55-year-old Japanese woman presented at our hospital complaining of hematochezia 4 months after surgery for a rectal carcinoma. A proctoscopy revealed 2 protuberant lesions in the rectum, 5 mm anally from the anastomotic suture line. The diagnosis of adenocarcinoma was confirmed by biopsy. It was considered that these lesions were caused by intraluminal implantation from the primary rectal carcinoma. The patient underwent an endoscopic resection for these recurrent lesions and has remained stable, with neither recurrence nor metastasis, in the 7 years since the resection. For rectal carcinoma, we propose early follow-up by proctoscopy, namely within 4 months after surgery.
Female↗
Survey of physicians' attitudes and practices in early cancer detection.
Most primary care physicians are already involved in some form of cancer detection in asymptomatic patients, and most say their involvement is increasing. With the exception of the proctoscopic examination and mammography, major detection procedures are being used with asymptomatic patients by a majority of physicians. In many instances, physicians' use of detection procedures does not conform with guidelines for the cancer-related checkup recommended by the American Cancer Society. Although they may disagree with some guidelines, most physicians agree they are generally helpful. Physicians disagree with guidelines for mammography, because they feel the cost of the test and radiation exposure associated with its use argue against patients' being tested annually, or being tested at all in the absence of symptoms. In contrast, belief that testing is needed at least once a year is the basis for physicians' disagreement with Pap test guidelines. Physicians also resist discontinuing use of the chest x-ray for early cancer detection, because they want to screen smokers annually. While there is substantial agreement on the value of proctoscopy in cancer detection in asymptomatic people, many physicians are not doing a proctoscopic exam if a patient's stool blood test is negative. Patient fear, discomfort, and the cost of testing influence physician decisions against proctoscopic examination. However, the growing interest in flexible sigmoidoscopy may change attitudes and influence practice toward more general use of proctoscopy. Primary care physicians widely support cancer education, both for the public and with patients in their own practice.
Adult↗
A controlled trial of azathioprine in the management of chronic ulcerative colitis.
To determine the efficacy of azathioprine in the treatment of ulcerative colitis, a 6-month double blind trial was carried out. Thirty patients with chronic ulcerative colitis who required the equivalent of at least 10 mg of prednisone per day over the 3 months prior to entering the study were randomized into placebo and azathioprine (1.5 mg per kg) treatment groups. Reduction of steriods was a major objective of the trial. Age and sex distribution, number of bowel movements, sense of well being, steroid dosage, and findings on proctoscopy, rectal biopsy, and colon X-ray initially were similar in the two groups. No side effects were associated with azathioprine. Although steroid dose was lower (p less than 0.05) in the azathioprine group at the termination of the study, no difference between the two groups could be detected in the number of bowel movements, sense of well being, and findings on proctoscopy during the first 3 weeks compared with the last 3 and during the first 3 months compared with the last 3. Although azathioprine does not confer dramatic benefit upon patients with chronic ulcerative colitis who require steroids, it does permit reduction of steroid dosage without apparent worsening of the disease. Its major value in ulcerative colitis may be in facilitating significant decreases or complete discontinuance of steroids.
Adolescent↗
Screening for colorectal cancer by primary-care physicians in Long Island (New York) and Connecticut.
Postal questionnaires on colorectal cancer screening practices were received from samples of primary-care physicians in Long Island, New York (LI-NY) (N = 190, 66.4% response rate), and in Connecticut (N = 215, 71.7% response rate). About 90% reported ever screening asymptomatic patients 50 years of age or older by fecal occult-blood test (FOBT), and 76-86% reported generally recommending such screening annually. Proportions who generally recommended screening by proctoscopy, 48% in LI-NY and 54% in CT, were higher than those reported in a 1984 survey by the American Cancer Society. About 40-43% of physicians, however, reported using proctoscopy (i.e., flexible sigmoidoscopy [FS]) only if the FOBT was positive. The major factors influencing screening by FS were the low probability of finding a lesion, cost to the patient, and patient fear or discomfort. Training in the use of FS, reported by 25-35% of physicians, was significantly more frequent in younger physicians (i.e., less than 50 vs. 50+ years of age). Differences in responses between physicians in LI-NY and CT were generally small. Over 90% of physicians reportedly obtained information on family history of cancer and 77-80% on family history of colorectal cancer for asymptomatic patients 40 years of age and older. A pragmatic approach to increasing screening for colorectal cancer is discussed, emphasizing higher-risk patients as defined by family history of cancer and personal medical history.
Colorectal Neoplasms↗