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PubMed2001

Endoscopic ultrasound-guided drainage of pancreatic pseudocysts or pancreatic abscesses using a therapeutic echo endoscope.

STUDY AIMS: The purpose of this study is to evaluate a new drainage technique for pancreatic pseudocysts or pancreatic abscesses entirely guided by endoscopic ultrasound (EUS) and using an interventional echo endoscope with a linear curved array transducer. PATIENTS AND METHODS: Between July 1996 and September 1999, EUS-guided drainage of a pancreatic pseudocyst or pancreatic abscess was carried out in 35 patients (26 men, 9 women; mean age 56.7, range 29-69). The mean size of the 35 pancreatic cysts was 7.8 cm (4-12 cm). Pancreatic pseudocysts were located in the head of the pancreas in two cases, in the body in six cases and in the tail in seven cases. On the other hand, the pancreatic abscesses were located in the tail of the pancreas in 17 cases and in the gastric wall in three cases. The EUS instrument used was the FG 38X endoscope manufactured by Pentax-Hitachi. RESULTS: No major complication occurred except in one case of a pneumoperitoneum, which was managed medically. Placement of the 7-F nasocystic drain was successful in 18/20 cases of pancreatic abscess. Surgery was performed in the two other patients. Concerning the pancreatic pseudocysts, placement of an 8.5-French stent was successful in 10 patients and of a nasopancreatic drain in five patients. In one case, only a puncture-aspiration was performed. One recurrence among the 15 pancreatic pseudocysts and two relapses of the 18 pancreatic abscesses have been observed, over a mean follow-up of 27 months (6-48 months). EUS-guided drainage was successful in 31/35 patients (88.5%); only four patients with pancreatic abscesses underwent surgery. No bleeding occurred during the time of this study. CONCLUSION: Internal drainage of pancreatic pseudocysts and abscesses exclusively performed with an echo endoscope is a safe and efficient method which should be evaluated further in larger studies.

Abdominal Abscess↗
PubMed2006

Endoscopic management of liver abscesses and cysts that communicate with intrahepatic bile ducts.

BACKGROUND AND STUDY AIMS: The formation of a communication between liver abscesses or cysts and intrahepatic bile ducts is an uncommon cause of significant bile leak. Surgical management of biliary fistulas is associated with high morbidity and mortality. We performed a prospective study of endoscopic management of this type of biliary fistula. PATIENTS AND METHODS: We studied 26 patients who had either liver abscesses or hepatic cysts that had ruptured into the intrahepatic bile ducts. The presence of a biliary fistula was suspected by jaundice and/or by the appearance of bile in percutaneous drainage effluent from a liver abscess and was confirmed by endoscopic retrograde cholangiopancreatography. Once the route of the fistula between the liver abscess or cyst and the intrahepatic bile duct had been defined by cholangiography, patients underwent treatment by sphincterotomy, and either biliary stenting or nasobiliary drainage. Nasobiliary drains or biliary stents (both 7 Fr) were placed according to standard techniques. Nasobiliary drains were removed when bile leakage stopped and closure of the fistula was confirmed by cholangiography; stents were removed after an interval of 4-6 weeks. RESULTS: Of a total of 525 patients with hepatic abscesses or cysts who were seen over a 5-year period, there were 26 patients who developed a demonstrable communication between liver abscesses (n = 20; 16 amebic, four pyogenic) or hydatid cysts (n = 6) and intrahepatic bile ducts (right intrahepatic bile ducts in 22 patients, left intrahepatic bile ducts in four patients). We performed either sphincterotomy with insertion of a nasobiliary drain (n = 20) or sphincterotomy with biliary stenting (n = 6). The fistulas healed in all patients after a mean time of 4 days (range 2-20 days) after endoscopic treatment. We were able to remove the nasobiliary drainage catheters and stents 6-34 days after their placement. CONCLUSIONS: In this case series, endoscopic therapy appears to be an effective mode of treatment for biliary fistulas complicating liver abscesses and cysts.

Adult↗
PubMed1996

[The MR tomographic diagnosis of intra- and paraspinal abscesses].

PURPOSE: Analysis of the MRT signals and their extent from intra- and paraspinal abscesses with reference to predisposing factors, their causes and localisation. PATIENTS AND METHODS: The histories and MRT findings in 34 Patients with intra- and paraspinal abscesses were evaluated retrospectively. Most of the patients (24/34) were older than 50 years. A second peak was below 30 years. RESULTS: 27/34 patients had some underlying disease which predisposed to infection, e.g., diabetes mellitus. The most common causal organisms were Staph. aureus (53%) and streptococci (15%). In 23/34 cases (68%), the abscesses were in the thoraco-lumbar or lumbar region, while only 6/34 occurred in the upper two-thirds of the thoracic spine and only 5/34 in the cervical region. In only 8/34 was the abscess confined to two vertebral lengths; in the remaining patients it was much more extensive. Intraspinal abscesses were about twice as large as the vertebral components and 1.5 times greater than paravertebral abscesses. The age of the abscesses could be estimated approximately from the signals. CONCLUSIONS: Contrast enhanced MRT permits detailed analysis of the compartments and exact estimation of the extent of the lesions and permits accurate monitoring of treatment.

Abscess↗
PubMed1998

[Otogenic brain abscess].

BACKGROUND: Otogenic complications are rare but typical following acute or chronic ear infections like mastoiditis and cholesteatoma. A life-threatening sequela is the otogenic brain abscess located in the temporal lobe or cerebellum. PATIENTS: At the ENT Department of the Medical University of Hannover/Germany we treated 8 patients suffering from otogenic brain abscesses in the temporal lobe during the last three years. The average age of the 6 male and 2 female patients was 48 years. In 5 patients the abscess developed due to a cholesteatoma with superinfection. Three cases showed acute mastoiditis. All patients were operated using an otosurgical retroauricular approach, in five cases a classical radical mastoidectomy was performed. In two cases the abscess was reached via mastoidal approach and was subsequently drained. In two other cases the abscess was drained some days later by neurosurgical approach due to increased neurological symptoms. The other patients were treated with high-dosed antibiotics under regular clinical and radiological control. RESULTS: In 7 cases complete regression of the abscess was achieved. Five patients were discharged without further otological or central-nervous problems. One female patient developed severe meningitis with generalized thrombosis of the central blood sinus system and died in central circulatory failure. Two other patients developed a moderate psychopathologic syndrome and were admitted to rehabilitation institutions. CONCLUSIONS: The analysis of our patients shows that otogenic brain abscesses should be regarded especially as a severe complication of the untreated cholesteatoma. It is important to use modern imaging modalities like computer tomography or MRI for early detection of the intracerebral lesion and to perform an early otosurgical intervention. Under antibiotics and CT control, healing of this severe complication can be achieved in most cases. However, the danger of acute and chronic ear diseases has to be kept in mind in all medical disciplines.

Adult↗
PubMed2000

Transrectal ultrasonographically guided drainage of gynecologic pelvic abscesses.

OBJECTIVE: This study assessed the feasibility of ultrasonographically guided transrectal aspiration of gynecologic pelvic abscesses to treat patients for whom intravenous antibiotic therapies failed and whose abscesses were not optimally amenable to colpotomy drainage or transabdominal or transvaginal ultrasonographically guided aspiration. STUDY DESIGN: This was a retrospective review of the first 15 women with pelvic abscesses that resulted from salpingitis or complications of gynecologic surgery who underwent transrectal pelvic abscess drainage after failure of antibiotic therapy. RESULTS: Purulent material was aspirated from the abscesses in 14 of the 15 women. All 14 women with aspirated material were successfully treated with real-time ultrasonographically guided transrectal drainage; only 4 of the 14 had indwelling catheter placement. CONCLUSION: Ultrasonographically guided transrectal drainage of gynecologic pelvic abscesses is a safe and effective treatment of pelvic abscesses for women who do not have an adequate response to antibiotic therapy.

Abscess↗
PubMed2001

Structural rationale for the modulation of abscess formation by Staphylococcus aureus capsular polysaccharides.

Staphylococcus aureus is a medically important bacterial pathogen that is a common cause of superficial and deep-seated abscesses in humans. Most S. aureus isolates produce either a serotype 5 or 8 capsular polysaccharide (CP) that has been shown to enhance bacterial virulence. We investigated the role of S. aureus CPs in modulating abscess formation in an experimental animal model of intraabdominal infection. Structural studies of CP8 revealed that it has a zwitterionic charge motif conferred by the negatively charged carboxyl group of N-acetylmannosaminuronic acid and free amino groups available on partially N-acetylated fucosamine residues. We report that purified CP5 and CP8 facilitated intraabdominal abscess formation in animals when given i.p. with a sterile cecal contents adjuvant. Chemical modifications that neutralized the positively or negatively charged groups on CP8 abrogated its ability to provoke abscesses. Rats prophylactically treated with CP8 s.c. were protected against abscess formation induced by homologous or heterologous zwitterionic polysaccharides. Likewise, treatment with CP8 protected against challenge with viable S. aureus strains PS80 (a capsule type 8 strain) or COL (a methicillin-resistant capsule type 5 strain). Purified CP8 was a potent activator of rat and human CD4(+) T cells in vitro. When transferred to naive rats, these activated T cells modulated the development of intraabdominal abscess formation. These results provide a structure/function rationale for abscess formation by S. aureus and expand the sphere of encapsulated organisms that interact directly with T cells to regulate this host response to bacterial infection.

Abdominal Abscess↗
PubMed2004

Persistent absence of ring-enhancement on CT with an encapsulated brain abscess.

Ring-enhancement on CT (RECT) is generally considered a sine qua non in diagnosing a cerebral abscess. We describe a 16-year-old female who presented with headaches, vomiting and drowsiness, which over 2 weeks rapidly progressed to coma. CT demonstrated a moderately large left frontal extradural abscess, associated with contiguous left frontal osteomyelitis, and underlying frontal and ethmoidal sinusitis. In addition, there was a large circular low density area within the left frontal lobe associated with midline shift that, owing to negative RECT, was assumed to represent nascent ischaemic cerebritis. Despite emergency twist-drill drainage of the extradural abscess, and antibiotic/corticosteroids administration, her clinical condition continued to deteriorate and two episodes of uncal herniation were reversed medically. Repeated CT, however, continued to demonstrate negative enhancement within the left frontal low density, although significant enhancement continued to be apparent with recurrent contiguous extradural suppuration. At definitive craniotomy, a large, well-encapsulated abscess cavity was excised from the left frontal lobe corresponding precisely to the area of previously negative enhancement, along with drainage of the recurrent extradural abscess. Thus, in addition to well-known 'false-positives' for RECT with a cerebral abscess, our case highlights the rare occurrence of a 'false-negative'. A low density mass lesion on CT with persistent negative RECT can neither be assumed to represent early cerebritis nor to exclude a mature abscess.

Adolescent↗
PubMed1997

Childhood brain abscess in Saudi Arabia.

The characteristics of childhood brain abscess in Saudi Arabia are outlined in this review of 17 consecutive cases treated at King Khalid University Hospital (KKUH) between 1985 and 1994. The data on 20 consecutive adults with brain abscess treated at KKUH during the same period were also analysed. Compared with series from the West, the children were unusual because of the relatively low incidence of cardiogenic and anaerobic abscesses and the relatively high incidence of post-traumatic, infratentorial and staphylococcal abscesses and sterile cultures. Compared with cases of brain abscess in adults, the children showed a much lower incidence of idiopathic abscess, a higher incidence of infratentorial abscess and a much better outcome. Factors accounting for the zero mortality rate in these children are discussed.

Adolescent↗
PubMed1998

Aerobic and anaerobic microbiology of retroperitoneal abscesses.

The aerobic and anaerobic microbiology of various types of retroperitoneal abscesses was studied by review of the clinical and laboratory data for 161 patients treated between 1974 and 1990 for such abscesses. These included 109 anterior, 8 posterior, 21 retrofascial, and 23 pelvic retroperitoneal abscesses. A total of 472 organisms (2.9 isolates/specimen)--204 aerobic and facultative (1.3/specimen), and 268 anaerobic (1.7/specimen)--were recovered. Aerobes only were recovered from 34 abscesses (21%), anaerobes only from 34 (21%), and mixed aerobic and anaerobic bacteria from 93 (58%). Polymicrobial infection was present in 132 patients (82%). The predominant aerobic and facultative isolates were Escherichia coli (60 isolates), Klebsiella pneumoniae (20), Streptococcus group D (19), and Staphylococcus aureus (11). The predominant anaerobes were Peptostreptococcus species (95 isolates), Bacteroides fragilis group (66), Prevotella species (22), and Clostridium species (22). The number of anaerobes per site always was greater than the number of aerobic or facultative organisms and was especially high in pelvic abscesses. The number of aerobic and facultative organisms was especially high in pancreatic abscesses. These data highlight the polymicrobial aerobic-anaerobic nature of retroperitoneal abscesses.

Abdominal Abscess↗
PubMed1978

Myocardial abscesses.

A review of postmortem materials from two teaching hospitals, accumulated in a 14-year period (1962--1975), disclosed 63 patients with myocardial abscesses among 12,359 autopsies, an incidence of 0.5%. All 63 patients had multi-focal myocardial abscesses; the lesions were grossly discernible in six patients. Coexisting infective endocarditis was present in approximately 20% (12) of the 63 patients with myocardial abscesses. Candida and Staphylococcus aureus were most common organisms responsible for the abscesses. Candida was identified in 23 patients (37%) by histologic examination of the heart sections, and 11 of these also had antemortem blood cultures positive for Candida. Staphylococcus aureus was cultured from the antemortem blood of 22 patients, two of whom also showed candidal organisms in the heart at necropsy. Eighty-one per cent (51) of 63 patients had abscesses in one or more extracardiac organs. It appeared that most of the myocardial abscesses had resulted from disseminated sepsis. Surgical conditions, malignancy and alcoholic hepatic disease were the most frequent primary conditions in patients with myocardial abscesses.

Abscess↗
PubMed1996

Outcome of medical treatment of bacterial abscesses without therapeutic drainage: review of cases reported in the literature.

The usual treatment of bacterial abscesses, except lung or tubo-ovarian abscesses, includes therapeutic drainage. Increasing evidence suggests that some abscesses respond to antimicrobial therapy without drainage. To study this issue, a MEDLINE search of the literature (1966-1994) was performed for cases of bacterial abscess in which treatment without definitive drainage was attempted. Four hundred sixty-five cases were identified. The most commonly involved organs were the liver, brain, and kidney. The success rate of antimicrobial therapy was 85.9%. Factors that predicted a less favorable outcome were abscess diameter of > or = 5 cm (odds ratio [OR] = 37.7; P = .0003), involvement of > or = 1 organism (OR = 5.2; P = .014), presence of gram-negative bacilli (OR = 3.4; P = .022), length of therapy of < 4 weeks (OR = 49.1; P < .0001), and use of an aminoglycoside as the only active agent (OR = 11.8; P = .008). Many bacterial abscesses can be treated without drainage; abscess size, the organisms involved, and therapy utilized may influence outcome.

Abscess↗
PubMed1980

Host factors in the formation of abscesses.

The role of host factors in the formation of subcutaneous abscesses due to Bacteroides fragilis or Staphylococcus aureus was investigated in athymic nude mice, mice deficient in the fifth component of complement (C5D), and mice pretreated with cobra venom factor (CVF). CVF-treated mice, inoculated with B. fragilis, had abscesses 62% larger than those of control mice at day 4 (P < 0.01), but no significant difference was observed when S. aureus was used. Athymic nude mice had significantly smaller abscesses than control animals at both days 4 and 7 after inoculation with either organism. There were no differences in abscess size or in the accumulation of neutrophils at day 4 when C5D mice were compared with control animals for either organism. The results suggested that the activity of the alternative complement pathway may influence abscess size and that chemotactic factors other than the fifth component of complement can supervene in C5D mice to produce encapsulated abscesses. The absence of thymic factors did not prevent containment of abscesses.

Abscess↗
PubMed1987

Legionella pneumophila lung abscess in a patient with systemic lupus erythematosus.

Lung abscess is an infrequently reported complication of Legionella pneumophila pneumonia associated with a high mortality rate. The risk factors, natural course, optimal method of diagnosis, and optimal therapy of this complication are not well defined. One case of Legionella pneumophila lung abscess occurring in a patient with systemic lupus erythematosus is described, and the reports of 26 other cases are reviewed. This complication is usually hospital-acquired and occurs predominantly in transplant recipients and systemic lupus erythematosus patients treated with corticosteroids with or without a cytotoxic drug. The time interval between the onset of immunosuppressive therapy and infection is usually of several weeks. Progression from pneumonia to abscess formation may be rapid, more commonly within an upper lobe. Transthoracic aspiration within the abscess cavity may be diagnostic, thus obviating the need for open lung biopsy. The prompt institution of erythromycin 4 gm daily intravenously followed by oral therapy for at least 4 weeks is associated with a high survival rate. Adequate drainage from the abscess cavity must be maintained. Radiologic healing may be slow. Long-term survival without relapse does occur. That the clinical spectrum of Legionella pneumophila infection includes lung abscess has not been sufficiently emphasized. This agent should be considered early in the differential diagnosis of lung abscess.

Adult↗
PubMed1981

Ultrasonography and amoebic liver abscesses.

Twenty-four patients were admitted to Kasr-El-Aini Hospital with suspected diagnoses of amoebic liver abscesses. The patients underwent clinical examinations, stool specimen analyses for cysts and trophozoites of Entamoeba histolytica, radiologic examinations, and routine liver function tests. In one patient, a liver scintiscan was obtained. Ultrasonographic examination was performed on all patients using the gray scale imaging technique. In 20 patients, the diagnoses of amoebic liver abscesses were demonstrated by ultrasonographic examination. In 19 patients, amoebic liver abscesses were verified by aspiration biopsies (95%), and one patient had a false-positive result. This false-positive result was due to a degenerated hepatoma, demonstrated by aspiration biopsy. Of the 19 patients, 12 patients (63.12%) had right lobe abscesses and seven (36.89%) had left lobe abscesses. The site, size and nature of the pus contained in the abscess could be determined by ultrasonographic examination and, therefore, helped in the management and technique of the aspiration biopsy. In addition, follow-up data could be more detailed using ultrasonographic examinations. Ultrasonographic examination is a noninvasive, safe, accurate, and rapid method of diagnosis, and is highly recommended as a routing procedure in all cases of suspected amoebic liver abscesses in the pre- and posttreatment stages of the disease. It is also recommended as an indicator of complete cure at follow-up examination.

Adult↗
PubMed1999

Imaging experimental intraabdominal abscesses with 99mTc-PEG liposomes and 99mTc-HYNIC IgG.

OBJECTIVE: To evaluate the accuracy of technetium-99m-labeled polyethylene glycol-coated liposomes (99mTc-PEG liposomes) and technetium-99m-labeled nonspecific human immunoglobulin G (99mTc-HYNIC IgG) for the scintigraphic detection of experimental intraabdominal abscesses in comparison with that of a standard agent, gallium-67 citrate. BACKGROUND: Scintigraphic imaging techniques can be very useful for the rapid and accurate localization of intraabdominal abscesses. Two newly developed radiolabeled agents, 99mTc-PEG liposomes and 99mTc-HYNIC IgG, have shown to be excellent agents for imaging experimental focal infection, but have not yet been studied in the detection of abdominal abscesses. METHODS: Intraabdominal abscesses were induced in 42 rats using the cecal ligation and puncture technique. Seven days later, randomized groups of rats received 99mTc-PEG liposomes, 99mTc-HYNIC IgG, or 67Ga citrate intravenously. The rats were imaged up to 24 hours after the injection. The biodistribution of the radiolabel was determined by counting dissected tissues ex vivo. Macroscopic intraabdominal abnormalities and focal uptake on the images were independently scored on a semiquantitative scale. RESULTS: 99mTc-PEG liposomes provided the earliest scintigraphic visualization of the abscess (as soon as 2 hours after the injection vs. 4 hours for the other two agents). Liposomes, IgG, and gallium all showed similarly high absolute uptake in the abscess. Focal uptake of liposomes and gallium correlated best with the extent of the macroscopic abnormalities. CONCLUSIONS: 99mTc-PEG liposomes and 99mTc-HYNIC IgG performed at least as well as the standard agent, 67Ga citrate, in the detection of experimental intraabdominal abscesses, with obvious advantages such as lower radiation exposure and more favorable physical properties. Of the two technetium agents, the liposomes seemed to be superior, providing the earliest diagnostic image and the best correlation with the inflammatory abnormalities. In addition, the preferential localization of radiolabeled PEG liposomes holds promise for targeted delivery of liposome-encapsulated drugs.

Abdominal Abscess↗
PubMed1999

Type A immunoglobulin deficiency presenting as a mixed polymicrobial brain abscess: case report.

OBJECTIVE AND IMPORTANCE: We present a case report of a patient with a left frontal brain abscess. Cultures obtained from the abscess at the time of surgery were identified as dental flora known to establish a synergistic relationship in polymicrobial infections. This type of synergistic relationship makes the clearance of an infection more difficult for an intact immune system. A serum immunoglobulin (Ig) Type A deficiency was identified postoperatively. This immunodeficiency may have contributed to the development of the abscess. CLINICAL PRESENTATION: The patient presented with headaches and photophobia. Computed tomography of the head performed with intravenously administered contrast demonstrated a left frontal brain abscess. INTERVENTION: The patient was operated on through a left frontal approach, carefully avoiding the frontal sinus. The abscess was aspirated, and the patient was treated with intravenous antibiotics for several weeks. Postoperatively, the patient did well. There were no signs of enhancement on follow-up computed tomographic scans at 7 and 12 months postoperatively. CONCLUSION: Through a comprehensive immunological workup, an IgA deficiency was identified postoperatively. Although the deficiency of a single type of Ig may be asymptomatic, complications from recurrent or chronic bacterial infections may occur. The deficiency of IgA, combined with a synergistic polymicrobial infection, contributed to the development of an intracranial abscess. A patient presenting with a brain abscess without any predisposing medical history should be evaluated for an underlying immune deficiency.

Adult↗
PubMed2001

Patent foramen ovale as a possible risk factor for cryptogenic brain abscess: report of two cases.

OBJECTIVE AND IMPORTANCE: Patent foramen ovale (PFO) has been suggested as a potential source of paradoxical embolism. A higher prevalence of PFO in ischemic stroke of unexplained cause has been recognized. Brain abscesses are commonly associated with a contiguous focus of infection, hematogenous spread from a distant focus, or cranial trauma. However, no predisposing factors, including a distant focus with unknown cause, are identified in approximately 15 to 30% of reported cases. CLINICAL PRESENTATION: We encountered two patients with brain abscess presumably caused by dental infections. Both patients displayed PFO, through which right-to-left atrial contrast shunting was revealed by transesophageal echocardiography. Although the radiological location of the abscesses suggested hematogenous spread as a cause, the patients had no arteriovenous shunting other than the PFO, despite exhaustive investigations for a potential infectious route. The patients displayed no definite focal orofacial inflammatory signs during the postoperative course despite diagnosis of pyorrhea alveolaris or periodontitis. INTERVENTION: In Patient 1, the abscess was aspirated stereotactically, and in Patient 2, the abscess disappeared radiologically after high-dose antibiotic treatment. CONCLUSION: The mechanism of brain abscess formation putatively related to PFO should be different from that related to common dental sepsis. Analysis of these cases suggested that infectious embolism from a latent or even identifiable focus through the PFO may be an underrecognized cause of brain abscess, in contrast to simple seeding of the brain via transit of the infecting bacteria through the valveless emissary veins.

Adult↗
PubMed1999

Management of pelvic abscess during pregnancy: a case and review of the literature.

UNLABELLED: Cases of pelvic or abdominal abscess complicating pregnancy are rare. Noninvasive diagnostic techniques including ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI) have enabled early diagnosis of this unusual complication of pregnancy. We describe a patient in whom the diagnosis of a pelvic mass was made by sonography and MRI at 25 weeks' gestation. At laparotomy, a pelvic abscess was partially resected and drained. Two weeks later when the patient again became symptomatic, a recurrent pelvic abscess was detected by CT and treated with intravenous antibiotics and CT-guided transcatheter drainage. The patient's recovery was thereafter uncomplicated and she delivered a healthy male infant by elective repeat cesarean at 38 weeks' gestation. The literature concerning pelvic and abdominal abscesses during pregnancy is reviewed. The potential advantages of imaging-guided, percutaneous transcatheter drainage for the treatment of such patients are emphasized. TARGET AUDIENCE: Obstetricians & Gynecologists, Family Physicians. LEARNING OBJECTIVES: After completion of this article, the reader will be able to understand the nonsurgical alternatives for the drainage of intraabdominal abscesses, the possible etiologies of intraabdominal abscess formation in the pregnant population, and the various approaches to percutaneous catheter drainage of intraabdominal abscesses.

Abscess↗