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Biomedical subjects

Y Dayal

Publications and source records attributed to Y Dayal.

At least 73 records · Page 4Linked to original sources

Chronic erosive gastritis--a recently recognized disorder.

We have reviewed the clinical manifestations, endoscopic findings, pathology, and upper gastrointestinal x-rays in 10 patients with chronic erosive gastritis, a disorder that was rarely recognized before the use of double-contrast upper gastrointestinal radiology and endoscopy. The characteristic x-ray appearance is that of a series of 3 to 11-mm nodules, some with central collections of barium, that are distributed along rugal folds and usually extend into the antrum. The endoscopic appearance is similar: small erythematous nodules with shallow central erosions. The pathology differs from that seen in peptic ulcer disease. There are few polymorphonuclear leukocytes and a predominance of plasma cells in the inflammatory infiltrate. Seven of our patients presented with epigastric pain similar to that of peptic ulcer disease; four of these also had anorexia and weight loss. In two other patients anorexia and weight loss were the only symptoms. One patient was asymptomatic. All nine symptomatic patients responded to antacid treatment. However, repeat x-rays demonstrated persistence of the nodules, although the central erosions usually disappeared. The etiology is unknown. Chronic erosive gastritis appears to be a distinct entity different from peptic ulcer disease.

Adult↗

Psammomatous somatostatinomas of the duodenum.

The presence of psammoma bodies in carcinoid tumors of the gastrointestinal tract is a rare occurrence; it has also been reported to be associated with features of somatostatin production by the tumor cells. The morphologic features of three such tumors arising in the duodenum were studied by a combination of histochemical, immunocytochemical, and ultrastructural techniques in an effort to delineate their secretory profile and further subclassify them. All tumors showed a mixed architectural pattern with prominent areas of glandular differentiation. The psammoma bodies were almost exclusively located within the glandular lumina. In each instance, the majority of tumor cells showed histochemical and immunocytochemical features of somatostatin-containing cells, and one tumor studied ultrastructurally showed numerous large- and small-sized intracytoplasmic secretory granules, both of which contained somatostatin. In contrast to other endocrine tumors of the duodenum that frequently have a multihormonal secretory profile, psammomatous duodenal carcinoids are associated with the exclusive presence of somatostatin within tumor cells. While many more of such examples of this uncommon tumor need to be systematically investigated for their immunocytochemical and ultrastructural characteristics, duodenal somatostatinomas need to be included in the differential diagnosis of psammomatous tumors.

Adenoma, Islet Cell↗

Rectal carcinoids as tumors of the hindgut endocrine cells: a morphological and immunohistochemical analysis.

The rectal mucosa is richly endowed with a constellation of amine and polypeptide hormone-producing endocrine cell types which may be identified by silver staining and immunohistochemical methods. In order to study the relationships of rectal carcinoid tumors to the normal hindgut endocrine cells, rectal carcinoids and normal rectal mucosa were compared for the presence of argentaffinity and argyrophilia and for the distribution of a battery of polypeptide hormones. Normal rectal mucosa contained frequent cells which stained for bovine pancreatic polypeptide (PP), human PP, and glucagon-like immunoreactivity (GLI. Somatostatin (SRIF) was present in a smaller proportion of rectal endocrine cells. Both argentaffin and argyrophil cells were encountered frequently in normal rectal mucosa. In the series of 13 rectal carcinoids examined, two cases were focally argentaffin-positive, while eight tumors revealed varying degrees of argyrophilia. Eight tumors contained immunoreactive bovine PP, and four of these tumors which were tested for human PP were also positively stained. SRIF was present in five cases, while GLI was identified in two tumors. Four of the tumors were multihormonal. Rectal carcinoids have a rich polypeptide hormone content which parallels that of the normal rectal mucosa. The distinctive hormonal profile and silver staining properties may prove to be of value as specific markers for carcinoid tumors of rectal or hindgut origin.

Animals↗

Aphakic glaucoma.

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Aphakia, Postcataract↗

Granulomatous hepatitis as a late complication of BCG immunotherapy.

A case of BCG-induced granulomatous hepatitis, which developed 1 1/2 years after BCG immunotherapy for recurrent malignant melanoma, is described to document the development of this disease entity as a potential late complication of BCG immunotherapy. The clinical implications of the late development of BCG-induced granulomatous hepatitis, use of immunosuppressive chemotherapy, and possible alternatives for BCG in intratumor immunotherapy are discussed.

Aged↗