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Query: UMLS:C0740577 (acute abdominal pain)
 1,982 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Although the majority of mesenchymal lesions of the gastrointestinal tract are neoplastic in nature, nonneoplastic reactive processes may involve the gastrointestinal tract and mesentery, causing diagnostic confusion with more aggressive neoplasms, such as fibromatosis or gastrointestinal stromal tumors. In this study, we report a series of fibroinflammatory lesions of the gastrointestinal tract that we think represent a relatively cohesive group of tumors and describe the clinical and pathologic features of this entity, which we have termed "reactive nodular fibrous pseudotumor." The tumors affected five patients (four male and one female patient) who ranged in age from 48 to 71 years (mean 56 years). Two patients presented with acute abdominal pain without a significant past medical history, two had incidental lesions discovered during evaluation for other medical conditions, and one was found to have an abdominal mass. Three patients had a history of abdominal surgery. The tumors were multiple in three patients and solitary in two patients. In four cases, at least one of the tumors involved the small intestine or colon, and the lesion was confined to the peripancreatic soft tissue in one case. The tumors were firm, tan-white, ranged in size from 4.3 to 6.5 cm in greatest dimension, and were grossly well circumscribed. All of the lesions were of low to moderate cellularity and composed of stellate or spindled fibroblasts arranged haphazardly or in intersecting fascicles. Three cases had microscopically infiltrative borders. The stroma was rich in collagen, which was wire-like, keloidal, or hyalinized. Intralesional mononuclear cells were sparse but were more numerous peripherally and frequently arranged in lymphoid aggregates. Immunohistochemical stains demonstrated that all of the tumors stained for vimentin, 80% stained for CD117 or muscle specific actin, 60% stained for smooth muscle actin or desmin, and none of the tumors stained for CD34, S-100 protein, or anaplastic lymphoma kinase-1. Follow-up information was available in all cases: four patients had no residual disease following surgical resection (mean follow-up 16.3 months) and one patient who had an incomplete surgical resection had stable disease at 26 months. In summary, we report a series of distinct intraabdominal fibroinflammatory pseudotumors that we have collectively termed "reactive nodular fibrous pseudotumors." These lesions are uncommon and may infiltrate the bowel wall, thereby mimicking primary bowel neoplasms or intraabdominal fibromatosis. Recognition of these nonneoplastic lesions is important, as they pursue a benign clinical course, but may be confused with other mesenchymal neoplasms that require more aggressive treatment.
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PMID:Reactive nodular fibrous pseudotumor of the gastrointestinal tract and mesentery: a clinicopathologic study of five cases. 1510 9

30-year-old woman admitted for acute abdominal pain with peritoneal signs was immediately operated with findings of hemorrhage in small pelvis. Laparotomy revealed hemorrhagic, friable mass 3 cm in maximum diammeter arising from the uterine horn. The neoplasm broadly invaded myometrium with no evidence of endometrial cavity involvement. Microscopically, the tumor displayed solid mosaic pattern and consisted of large epithelioid cells with ample eosinophilic, finely granular cytoplasm ongoing apparent clear cell change elsewhere. There was marked nuclear irregularity with numerous atypical mitotic figures and multiple bizarre giant elements dispersed throughout the lesion. Unusual complex phenotype included co-expression of vimentin, smooth muscle actin, desmin, HMB45, Melan A, CD10 and EMA. No obvious stigmata of tuberous sclerosis were found and a five months follow-up after chemotherapy indicated no progression of disease. With some uncertainty the tumor was finally rendered as pleomorphic leiomyosarcoma with peculiar melanocytic differentiation. PEComa as an alternative term was coined. Expressed are both difficulty in explaining the histogenesis and ambiguity of the existing terminology of the uterine tumors with mixed myoid and melanocytic phenotype. Reviewed is the literature and discussed is the differential diagnosis.
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PMID:[Pleomorphic epithelioid/clear cell malignant tumor of the uterus exhibiting both myoid and melanocytic differentiation--leiomyosarcoma or PEComa? A case report and a review of the literature]. 1782 38