Fig. 2

Findings of cystoscopy, colon fibroscopy, and endoscopic ultrasonography. a Cystoscopy showing compression of the trigone of the bladder by external masses, but no visible tumor in the lumen. b Colon fibroscopy showing compression of the anterior rectal wall and no tumor in the tract. c Endoscopic ultrasonography revealing clearly defined hypoechoic mass localized in the anterior wall of the rectum. d Doppler-echo showing that the mass is well vascularized at the periphery