双语教学

Explain of Gastrointestinal Pathology

127.Prolapsed true hemorrhoids, gross

Seen here is the anus and perianal region with prominent prolapsed true (internal) hemorrhoids. Hemorrhoids consist of dilated submucosal veins which may thrombose and rupture with hematoma formation. External hemorrhoids form beyond the intersphincteric groove to produce an "acute pile" at the anal verge. Chronic constipation, chronic diarrhea, pregnancy, and portal hypertension enhance hemorrhoid formation. Hemorrhoids can itch and bleed (usually bright red blood, during defacation).

（本图片资料来源自美国犹他大学）