Rectal polyp: A leiomyoma arising in association with muscularis mucosae. These are usually recognizable on "H&E," as noted years ago.
Refs: Miettinen M, Sarlomo-Rikala M, Sobin LH. Mesenchymal tumors of muscularis mucosae of colon and rectum are benign leiomyomas that should be separated from gastrointestinal stromal tumors--a clinicopathologic and immunohistochemical study of eighty-eight cases. Mod Pathol. 2001 Oct;14(10):950-6. PMID: 11598163.
Case provided by Dr. Elizabeth Montgomery, Professor of Pathology and Vice Chair of Anatomic Pathology at the University of Miami, and Editor-In-Chief at Innovative Science Press. You can check out our titles at:
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