Megarectum is a large rectum as a result of underlying nerve supply abnormalities or muscle dysfunction, which remains after disimpaction of the rectum. The Principles of Surgery textbook describes any rectum that can hold more than 1500cc of fluid as a megarectum. The term megarectum is also used for a large rectal mass on rectal examination, a w...
Extreme dilation of the rectum. ... (05 Mar 2000) ... 
(meg″ә-rek´tәm) megacolon confined to the rectum.
Type: Term Pronunciation: meg′ă-rek′tŭm Definitions: 1. Extreme dilation of the rectum.