Fig. 10
From: What is hiding in the hindgut sac? Looking beyond rectal carcinoma
Rectal GIST in a 55-year-old man with a palpable mass on digital rectal examination. a Transrectal ultrasound reveals a hypoechoic vascular mass (arrow) arising from the rectal wall. b Sagittal and c axial T2-weighted MRI reveals the lesion (arrow) to be heterogeneously hypointense and is arising exophytically from the right anterolateral wall. d Sagittal fat-suppressed T1-weighted MRI reveals the lesion (arrow) to be intermediate signal intensity and e contrast-enhanced T1-weighted MRI reveals intense enhancement (arrow). f The mass is bright on diffusion-weighted (b-1,000) MRI