<unk>  are the dilation of collateral submucosal vessels due to backflow in the veins of the rectum. Typically this occurs due to portal hypertension which shunts venous blood from the portal system through the portosystemic anastomosis present at this site into the systemic venous system. This can also occur in the esophagus, causing esophageal<unk> , and at the level of the umbilicus, causing caput medusae. Between 44% and 78% of patients with portal hypertension get<unk> .
Anorectal varices
Anal fissure
Gastric varices
Anal fistula
Anal cancer
Genital ulcer
Anal wink
Perianal hematoma