Figure 1From: Collision tumour involving a rectal gastrointestinal stromal tumour with invasion of the prostate and a prostatic adenocarcinomaA: Rectal GIST: Excrescent and ulcerated rectal mass with stenosis of the rectal lumen. B: Rectal GIST with prostatic infiltration: rectal tumour with direct invasion of both adjacent lobules of the prostate. UB: urinary bladder; ADC: prostatic adenocarcinoma; AC: Anal canal; R: rectum; P: prostate.Back to article page