High-grade leiomyosarcoma of the transverse colon presenting with bowel perforation

Stromal or mesenchymal tumors account for about 1% of gastrointestinal (GI) tract neoplasms and are divided into 2 main categories: the gastrointestinal stromal tumors (GISTs; 60%- 90% of mesencymal tumors), and the non-GIST neoplasms (10%-30% of mesencymal tumors).¹ The non-GIST neoplasms consist of a heterogenous group of soft-tissue tumors, identical to soft-tissue tumors elsewhere in the body.

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