Abstract
We report a case of gastrointestinal stromal tumor (GIST) arising from the rectum which mimicked prostatic tumor on computed tomography (CT) and magnetic resonance imaging (MRI). Most GISTs arise in the stomach and/or small intestine; GISTs of anorectal origin are rare. We identify characteristic CT and MRI findings of anorectal GISTs and discuss the diagnostic pitfalls.
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