Gastrointestinal stromal tumors (GISTs) are a subset of GI mesenchymal tumors of varying differentiation. Previously, these tumors were classified as GI leiomyomas, leiomyosarcomas, leiomyoblastomas, or schwannomas, on the basis of histologic findings and the fact that these tumors apparently originate in the muscularis propria layer of the intestinal wall. With the advent of immunohistochemical staining techniques and ultrastructural evaluation, GISTs now are recognized as a distinct group of mesenchymal tumors. In the present classification, GISTs account for approximately 80% of GI mesenchymal tumors
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