Abstract
Stromal or mesenchymal neoplasms affecting the gastrointestinal (GI) tract typically present as subepithelial neoplasms. The most common group consists of neoplasms that are collectively referred to as GI stromal tumors (GISTs). They are most often located in the stomach and proximal small intestine.1 Because all GISTs are now regarded as potentially malignant (especially those larger than 1 cm), consensus classifications focus on stratifying lesions (clinicopathobiologic risk categorization) according to the relative risk of recurrence and metastasis.2 This article is part of an expert video encyclopedia.
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