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Query: UMLS:C0001430 (adenoma)
 21,222 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Neoplasms of the upper respiratory comprised primarily of eosinophilic cells are, in general, rare, and they include a diverse group of lesions. Low-grade oncocytic neuroendocrine neoplasms (so-called oncocytic carcinoids) can be encountered in several locations throughout the respiratory tract. The oncocytoma and related entities, lesions that presumably arise from minor gland tissue, can likewise be seen from the nasal cavity to the lung; differences in clinical significance may relate to the location of such lesions, and are discussed herein. Granular cell tumor is another entity that can involve both the upper respiratory tract and lungs, and specific features of this lesion in different anatomic sites are highlighted. The oncocytic variant of Schneiderian papilloma is an important nasal lesion to recognize, because of important therapeutic and prognostic implications of that diagnosis. Finally, unique oncocytic variants of glomus tumor and pulmonary alveolar adenoma are discussed, as well as eosinophilic varieties of pulmonary carcinomas and mesotheliomas.
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PMID:Oxyphilic proliferations of the respiratory tract and paranasal sinuses. 1045 76

A 47-year-old Japanese woman with a 5-year history of alcoholism was admitted to the Ryukyu University Hospital for the treatment of the alcoholism. For evaluation of observed changes in her bowel habits, she underwent colonoscopy, which revealed seven small polyps spread throughout the entire large intestine. Six of the polyps were in the colon; one was an adenoma and five were hyperplastic polyps. The remaining polyp, in the rectum, was an 8-mm submucosal tumor. Pathological analysis of a biopsy of the lesion in the rectum indicated a possible diagnosis of adenocarcinoma. Endoscopic ultrasonography (EUS) demonstrated a submucosal hypoechoic nodule, involving the mucosa and the muscularis propria. Subsequently, the patient underwent a radical low anterior resection of rectum. The lesion was a submucosal tumor with ulceration. The tumor consisted of granular tumor cells which were positive for S-100 protein, neuron-specific enolase, and periodic acid schiff (PAS) stain, but negative for desmin and vimentin. Granular cell tumor is rare in the gastrointestinal tract. As a result, such tumors can be misinterpreted to indicate a possible malignancy on either a biopsy or EUS.
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PMID:Granular cell tumor of the rectum: a case report and review of the literature. 1095 3

Granular cell tumor (GCT) is commonly located in the subcutaneous tissue and oral cavity, and uncommon in the gastrointestinal tract, in which the majority arises in the esophagus with over-representation in African Americans (AA). However, experience with GCTs of the colorectum is quite limited. We report the clinicopathologic features of 1 of the largest series to date of colorectal GCTs. We reviewed the clinical features of 26 colorectal GCTs seen at our institution between the years 1995 to 2009, which included 24 biopsies, 1 low anterior resection, and 1 colectomy. Review of the clinical features of all 26 cases from 24 patients identified an equal gender distribution (12 males and 12 females), with patients ranging in age from 31 to 60 years (mean, 49.8 y; median, 51.5 y) with a modest White predominance (15/24, 63%; our overall patient population is 67% White). The majority of colorectal GCT involved the right colon (19/26, 73%) ranging in size from 0.2 to 1.8 cm (mean 0.6 cm). Most neoplasms were encountered on routine colonoscopy (14/24, 64%), however 3 patients presented with hematochezia, 3 with changing bowel habits, 2 with Crohn disease, 1 with diverticular disease, and 1 with appendicitis. Of the 20 cases available for histologic review, the tumors were noted to either be infiltrative (12/20, 60%) or marginated (8/20, 40%) involving either the mucosa (7/20, 35%), submucosa (10/20, 50%), or both (3/20, 15%). The microscopic features were similar to those of GCTs found elsewhere, but many of the neoplasms differed by displaying nuclear pleomorphism (8/20, 40%), lymphoid cuffs (9/20, 45%), and focal calcification (7/20, 35%). Some had reactive mucosal surface changes (7/20, 35%), including 1 initially misdiagnosed as a tubular adenoma. Neither mitoses nor necrosis were identified. On immunochemistry, 18 of the neoplasms were stained for S-100 and all cases showed positive staining. Follow-up information was available for 19 patients (19/24, 79%) with 2 documented occurrences of regrowth at the prior cecal biopsy site owing to incomplete excision, but no metastases. Although infrequently found in the colorectum, colorectal GCT typically presents incidentally on routine colonoscopy and involves the right colon; it is not over-represented in AA patients. GCTs can have both an infiltrative or marginated growth pattern with a subset displaying nuclear pleomorphism, a lymphoid cuff, focal calcification, and reactive mucosal surface changes, which in our experience, may lead to misdiagnosis on colorectal mucosal biopsies. Although GCTs were benign tumors in this series, if incompletely excised regrowth of the lesion may occur and therefore, follow-up may be warranted.
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PMID:Colorectal granular cell tumor: a clinicopathologic study of 26 cases. 2066 Oct 17

Granular cell tumors (GCTs) have been described as neoplasms of Schwann cell origin. They are often benign and notably uncommon in the gastrointestinal tract. Recently, their incidence has become more common, likely as a result of increased colonoscopy screenings. Very few data exist regarding their potential for malignancy, but malignant GCTs have been reported. Here, we report the case of a young female patient who was diagnosed with an atypical GCT on the ileocecal valve with an overlying tubular adenoma which was found incidentally on colonoscopy. This represents the first known report of a GCT with atypical features on the ileocecal valve, as well as a rare case of overlying adenomatous changes. Due to the paucity of cases, there is no clear modus operandi for their management. Furthermore, it is not clear whether surgical or endoscopic interventions or simple observation may be most appropriate. Further studies are needed to evaluate the potential for malignancy of this tumor, as well as its management.
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PMID:Coexisting Granular Cell Tumor and Tubular Adenoma of the Ileocecal Valve. 2951 39