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Biomedical subjects

M S Shin

Publications and source records attributed to M S Shin.

At least 109 records · Page 6Linked to original sources
PubMed1986

Congenital pulmonary vein stenosis: a radiographic study.

Seven patients with congenital pulmonary venous stenosis were retrospectively evaluated. Chest radiographs and pulmonary angiograms were interpreted without knowledge of anatomic findings, and results were correlated with autopsy data. Bilateral foci of stenosis of varying severity were found in all patients but occurred with greater frequency and severity in the left-sided pulmonary veins. Chest radiographic findings revealed asymmetric pulmonary vascularity in all patients. Shunt vascularity was seen in three right upper zones and three right lower zones but was not observed in any of the left lung zones. In seven patients angiograms revealed asymmetry in the size and number of pulmonary arterial branches. Arterial vascularity was increased in two right upper zones and four right lower zones but was not increased in any of the left lung zones. Pulmonary veins from 22 zones were visualized. Pulmonary venous opacification was delayed, asymmetric, and asynchronous in the majority. Venoatrial stenosis was seen in veins from 18 zones. Congenital pulmonary vein stenosis can be suspected based on chest radiographic findings of asymmetry of pulmonary vascularity between both lungs as well as regional discrepancies in the vascularity within each lung. Pulmonary angiography can support the diagnosis.

Angiography↗
PubMed1986

Giant cell carcinoma of the lung. Clinical and roentgenographic manifestations.

Giant cell carcinoma of the lung is an unusual form of pulmonary malignancy that follows an extremely aggressive clinical course. We report the clinical and roentgenographic manifestations of 14 patients with pathologically proven giant cell carcinoma of the lung, and compare our data to other reports in the literature. Our patients often presented with or developed constitutional or nonthoracic symptoms. This neoplasm was characterized by early evidence of widespread metastases. However, extension of tumor to the chest wall was not as frequent in our series as has been previously described. The survival from the time of diagnosis was extremely short. Any hope of successful treatment of this neoplasm depends on prompt, early diagnosis. Pulmonary giant cell carcinoma should be included in the differential diagnosis of large, round or oval, sharply outlined peripheral lung masses.

Adult↗
PubMed1986

Radiographic manifestations of bronchiolitis obliterans with organizing pneumonia vs usual interstitial pneumonia.

The radiographic findings in 24 cases of bronchiolitis obliterans with organizing pneumonia and 16 cases of usual interstitial pneumonia were reviewed and compared. Some cases of bronchiolitis obliterans with organizing pneumonia have been mistaken for usual interstitial pneumonia, although the two diseases have distinct pathologic findings. Clinically, the diseases often have different manifestations. Bronchiolitis obliterans with organizing pneumonia has a better prognosis and often responds well to steroids. This study shows that the radiologic findings of bronchiolitis obliterans include alveolar opacities without lung-volume loss. Patients with usual interstitial pneumonia, however, have bilateral diffuse interstitial opacities with occasional honeycomb changes, and there is loss of lung volume in most patients. These findings suggest that the chest radiograph can aid in distinguishing the two diseases.

Adult↗
PubMed1985

Appendicolith. Significance in acute appendicitis and demonstration by computed tomography.

A case of periappendical abscess is presented in which the diagnosis was made by demonstration of an appendicolith in a large abscess cavity by computed tomography (CT) in conjunction with the clinical signs and symptoms. However, the appendicolith was not detected by plain film radiography. We stress that CT is more sensitive in detection of such small calcified bodies than plain film radiography and that the true incidence of appendicolith in acute appendicitis could be higher than that reported previously.

Abscess↗
PubMed1985

Metastatic mediastinal neoplasm masquerading as aortic dissection: a skip sign on computed tomography for their distinction.

Four years after undergoing a left lower lobe lobectomy for squamous cell carcinoma, a 77-year-old man presented with a mass lesion in the left upper mediastinum associated with chest pain. Computed tomography revealed a homogeneous density immediately adjacent to the aortic arch and thoracic aorta consistent with aortic dissection. Upon thoracotomy, however, the lesion was found to be an oat cell carcinoma. Retrospective review of the computed tomography scans detected a normal segment of descending aorta, indicating the interruption of the paraaortic lesion. Such a skip sign can be used to rule out aortic dissection.

Aged↗
PubMed1985

Massive mediastinal Hodgkin's disease with calcification masquerading teratocarcinoma: differentiation by computed tomography.

Two young patients with similar radiographic manifestations of massive opacification of left hemithorax with scattered calcification highly suggestive of mediastinal teratocarcinoma are reported. By biopsy, one patient was proved to have teratocarcinoma and the other patient was proved to have Hodgkin's disease. Retrospective review indicates that spontaneous neoplastic calcification in Hodgkin's disease, though rare, can occur prior to therapy. Computed tomography is useful in distinguishing such cases of Hodgkin's disease from teratocarcinoma by demonstrating the involvement of the posterior mediastinum and homogeneous density.

Adult↗
PubMed1985

Dense liver in a 72-year-old woman with congestive heart failure.

Amiodarone is a cardiac antiarrhythmic agent now undergoing clinical trials in the United States. Its most important side effect is pulmonary toxicity, which may present radiographically in two forms. One is similar to eosinophilic pneumonia with peripheral alveolar opacities but without any of the laboratory or pathologic findings. A second presentation is as a bilateral interstitial pattern resembling interstitial pulmonary edema. This is often mistaken for heart failure in the clinical and radiographic setting. Amiodarone also causes a phospholipidosis of the liver, which is usually asymptomatic but on occasion may present as hepatitis. On abdominal CT the liver will have an abnormally high attenuation (80-140 HU), which appears to be due to accumulation of an amiodarone metabolite in hepatocytes. This appearance is usually distinguishable from the other causes of increased hepatic attenuation by virtue of other CT criteria and clinical history. However, from a radiographic standpoint alone, the combination of acute congestive heart failure and an abnormally dense liver may result in at least an initial misdiagnosis of advanced primary hemochromatosis.

Aged↗
PubMed1985

Alveolar cell carcinoma: diagnostic pitfalls in evaluating the chest roentgenogram.

We have reported two cases of biopsy-proven alveolar cell carcinoma, both initially thought to be pulmonary edema. The purpose of this report is to stress the variations of the roentgenographic pattern in alveolar cell carcinoma and to suggest that fiberoptic bronchoscopy with biopsy should be considered when a pattern thought to be that of pulmonary edema does not resolve with appropriate therapy.

Adenocarcinoma, Bronchiolo-Alveolar↗
PubMed1984

Computed tomographic distinction of submucosal lipoma and adenomatous polyp of the colon.

Described here is a patient with 2 large pedunculated colonic tumors detected by barium enema radiography. By computed tomography (CT) 1 was found to be a submucosal lipoma characterized by oval shape, smooth demarcation, and homogeneous density with a CT number of -68 HU, whereas the other was an adenomatous polyp with slightly fuzzy outline and a much higher CT number. This case indicates that CT can be a definitive diagnostic modality for distinguishing between a colonic lipoma and other solid or cystic tumor of the colon.

Barium Sulfate↗
PubMed1984

The septal arteries in the differential diagnosis of constrictive pericarditis.

Angiographic study of the motion of the septal and left marginal arteries was performed in patients with restriction in ventricular diastolic filling in order to separate patients with constrictive pericarditis from those with restrictive cardiomyopathy. Twelve patients with constrictive pericarditis (group I) and 10 patients with restrictive cardiomyopathy (group II) were evaluated and compared with 21 patients with normal coronary angiograms (group III). The displacement of the septal arteries (23 +/- 2.04 mm) was abnormally exaggerated in group I and normal (9 +/- 0.81 mm) in groups II and III. The displacement of the left marginal arteries as seen by the "corrugating index" was similar in all groups. We conclude that study of the displacement of the septal arteries is a useful angiographic sign that helps to separate constrictive pericarditis from restrictive cardiomyopathy and normals.

Cardiomyopathies↗
PubMed1984

Computed tomography evaluation of bilateral bronchostenosis caused by sclerosing granulomatous mediastinitis: a complication of histoplasmosis.

A proved case of histoplasmosis with sclerosing granulomatous mediastinitis complicated by severe bilateral bronchostenosis in a 28-year-old woman is reported. The case demonstrates that this relatively benign disease can lead to grave consequences and that computed tomography is extremely useful in the evaluation of this mediastinal lesion, particularly when plain chest radiography is noncontributory.

Adult↗
PubMed1984

Abdominal tuberculosis: CT findings.

The computed tomographic (CT) characteristics of intraabdominal tuberculosis are not specific. A recent article from South Africa proposed a set of criteria that included high density ascites and mesenteric involvement, consisting of thickening and adenopathy, as possible criteria for the diagnosis of tuberculous peritonitis by CT. Review of three additional cases of abdominal tuberculosis showing these findings supports the criteria defined in the earlier study. Although not definitive, these findings in the appropriate clinical setting should suggest the possibility of tuberculosis.

Adult↗