Figure 1From: Perivascular epithelioid cell tumor of the rectum: report of a case and review of the literatureFindings on colonoscopy and endoanal ultrasound scanning. (a) Colonoscopic examination showed a submucosal tumor 3Â cm in diameter arising in the posterior rectal wall. (b) Endoanal ultrasound scanning showed a heterogeneous, low-echoic tumor with a nodular appearance arising in the muscularis (long arrow) of the posterior rectal wall.Back to article page