Fig. 9
From: What is hiding in the hindgut sac? Looking beyond rectal carcinoma
Rectal GIST in a 62-year-old man presenting with pain and rectal bleeding. a Sagittal T2-weighted MRI reveals a heterogeneous isointense to hypointense mass (arrow) arising from the anterior wall of the rectum and projecting into the rectoprostatic space. b Sagittal T1-weighted MRI reveals the lesion to be isointense on T1-weighted MRI with a few areas of hyperintensity (arrowheads) representing haemorrhage. c Sagittal and d axial contrast-enhanced MRI demonstrates intense enhancement (arrow) with central areas of non-enhancement (arrowhead) representing necrosis