Microscopic gastrointestinal stromal tumors in esophageal and intestinal surgical resection specimens: a clinicopathologic, immunohistochemical, and molecular study of 19 lesions

The American Journal of Surgical Pathology
Abbas AgaimyLuigi Tornillo

Abstract

Microscopic gastrointestinal stromal tumors (GISTs) (synonyms: sporadic interstitial cell of Cajal hyperplasia, seedling GISTs, minimal GISTs) are common incidental findings in gastroesophageal resections (9% to 35%). To our knowledge, their frequency, clinicopathologic features, and molecular pathogenesis from nongastroesophageal sites have so far not been sufficiently analyzed. We studied 19 lesions from distal esophagus (n=8), gastroesophageal junction (n=2), sigmoid colon (n=5), and vermiform appendix, cecum, rectum, and small intestine (1 each). Microscopic GISTs were detected in 0.2%, 0.1%, and 0.01% of routinely processed resection specimens from sigmoid colon, vermiform appendix, and rectum, respectively. Patients were 11 men and 8 women with a mean age of 66 years (range, 57 to 86 y). Thirteen patients had GI cancers and 5 had diverticular disease. None has a family history of GIST or features of neurofibromatosis 1. Lesions were 0.5 to 4 mm in size (mean, 1.12 mm), were all spindled and had noncircumscribed infiltrating borders. All arose in the muscularis propria and 2 were predominantly subserosal. Immunohistochemistry revealed a CD117/CD34/smooth muscle actin-negative phenotype in 18/19 lesions. Three KIT exon 11 m...Continue Reading

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