1/6. Combined yolk sac tumor and adenocarcinoma in a gastric stump: molecular evidence of clonality.BACKGROUND: Extragonadal yolk sac tumors of the gastrointestinal tract are extremely rare neoplasms. Their greater rarity compared with other extragonadal yolk sac tumors suggests that different pathogenetic mechanisms could be involved according to the site of origin. This report describes a case of a combined yolk sac tumor and adenocarcinoma that arose in a gastric stump in a man age 61 years 43 years after he underwent distal gastric resection and gastrojejunostomy (Billroth II operation) for a benign duodenal ulcer. The coexistence of an adenocarcinomatous component with the yolk sac component suggests that the two histologic patterns may represent distinct phenotypes arising from a common mucosal epithelial cell. methods: Immunohistochemical and molecular techniques were used to define the mutation pattern of p53 in both components of the tumor. RESULTS: Single-strand conformation polymorphism and sequencing analyses demonstrated the same pattern of p53 mutation in the adenocarcinomatous and yolk sac tumor components. CONCLUSIONS: This finding suggests that the two tumors could have been derived from the same cellular clone and supports the hypothesis that the two components represented a heterogeneous differentiation of the same tumor.- - - - - - - - - - ranking = 1keywords = neoplasm (Clic here for more details about this article) |
2/6. Gastric schwannoma.Gastrointestinal mesenchymal tumors are a group of tumors originated from the mesenchymal stem cells of the gastrointestinal tract, consisting of gastrointestinal stromal tumors (GIST), leiomyomas or leiomyosarcomas or schwannomas. Gastric schwannoma is a very rare gastrointestinal mesenchymal tumor, which represents only 0.2% of all gastric tumors and 4% of all benign gastric neoplasms. We report a 24-year-old girl who suffered from an episode of upper gastrointestinal bleeding. The endoscopic examination showed a round submucosal tumor with a central ulceration and bleeding over the high body of the stomach. Surgical resection of the tumor was performed. The pathological examination revealed a picture of spindle cell tumor that was strongly positive for S-100 protein stain, and non-reactive for CD34, CD117, actin, HHF-35, desmin, melan-A and HMB-45, consistent with gastric schwannoma. The literature is reviewed.- - - - - - - - - - ranking = 1keywords = neoplasm (Clic here for more details about this article) |
3/6. Intramural hemorrhage simulating gastric neoplasm.We report a case of benign gastric ulcer with secondary extensive intramural hemorrhage causing a radiographic appearance consistent with a large ulcerated gastric neoplasm. This is the second such case reported and the first studied with sonography and computed tomographic scan. A brief review of the literature on intramural gastric hematoma is presented.- - - - - - - - - - ranking = 5keywords = neoplasm (Clic here for more details about this article) |
4/6. Non-gastrin secretogogue in ulcerogenic tumors of the pancreas.In 18 patients with hypersecretion of acid, severe ulcer diathesis, and pancreatic islet cell tumor or hyperplasia, 14 had hypergastrinemia and 4 had normal plasma gastrin concentration. The neoplasms contained several gut peptides beside gastrin. The immunoreactive gastrin in the tumor extracts measured less than 7 ng/g, less than the amount previously reported. The extracts of each patient's tumor also contained a secretogogue other than gastrin that stimulated gastric acid secretion in rats. In addition, the plasma extracts of 2 patients also contained a secretogogue that stimulated acid secretion. After surgical resection of a recurrent metastatic tumor in 1 patient, basal acid secretion decreased from 13.9 to less than 1 meq/h, and the bioactivity of the plasma disappeared. These observations suggest the existence of a secretogogue that appears to be a protein in the pancreatic tumors of some patients with severe ulcer diathesis and hypersecretion.- - - - - - - - - - ranking = 1keywords = neoplasm (Clic here for more details about this article) |
5/6. gastrinoma of the common bile duct: immunohistochemical and ultrastructural study of a case.Primary endocrine neoplasms of intra- and extrahepatic biliary ducts are very rare. We describe the first case of a primary endocrine tumor of the common bile duct producing gastrin. A 53-year-old woman had a 3-year history of recurrent duodenal and gastric ulcers as well as obstructive jaundice. A small neoplasm was found in the lower third of the common bile duct, which showed diffuse gastrin production and focal synthesis of serotonin and pancreatic polypeptide by immunohistochemistry and electron microscopy. Although serum gastrin was within normal levels (90 ng/ml), symptoms of peptic acid disease could have been related to hypergastrinemia, since gastric and duodenal ulcers healed after surgical removal of the tumor. She has remained asymptomatic for 8 months.- - - - - - - - - - ranking = 2keywords = neoplasm (Clic here for more details about this article) |
6/6. Case report: gastric carcinoma as a complication of dyskeratosis congenita in an adolescent boy.dyskeratosis congenita (DC), or the Zinsser-Engman-Cole syndrome, is a rare X-linked heritable disorder, affecting primarily the ectodermal tissues, with hyperpigmentation of the skin, leukoplakia of the buccal and anal mucosa, and nail dystrophy (1, 2). Aplastic anemia (3) and a variety of neoplasms (4, 5) are some of the extraectodermal manifestation of this disorder, which although X-linked recessive, has also been described in a few females (6, 7). Mental retardation, diarrhea, and gastrointestinal bleeding have been considered to be less frequent features (8). We report an adolescent Indian male who presented with all the ectodermal manifestations, as well as mental retardation, bone marrow aplasia, and gastrointestinal hemorrhage secondary to adenocarcinoma of the stomach.- - - - - - - - - - ranking = 1keywords = neoplasm (Clic here for more details about this article) |