Supplemental Material for: DiffuseCavernous Hemangiomaof theRectum Diagnosedafter a 15-yearHistoryofRecurrent Gastrointestinal Bleeding: A Case Report

Owing to its rarity and nonspecific presentation, DCHR is frequently misdiagnosed as hemorrhoidal disease or inflammatory bowel disease, culminating in substantial diagnostic delay.Reports on laparoscopic surgery for DCHR are limited.</p><p dir="ltr">Case presentation: A 26-year-old woman was referred to our institution fortheevaluation of microcytic anemia and recurrent painless hematochezia associated with defecation since childhood, persisting for over 15 years.

Lower gastrointestinal endoscopyrevealedbluish-purple dilated and tortuous vessels throughout the rectum, accompanied by mucosal swelling and congestion. Contrast-enhanced computed tomography demonstrated diffuse rectal wall thickening with gradual enhancement and serpentine dilated vessels with numerous phleboliths in the mesorectum, leading to a diagnosis of DCHR.Laparoscopic intersphincteric resection (Lap-ISR) with a diverting loop ileostomy was performed, with an estimated blood loss of 310 mL.