Figure 2.

A 33-year-old woman with familial adenomatous polyposis (FAP)-associated desmoid fibromatosis. (a) Axial fat-suppressed post-gadolinium T1-weighted MR image of the pelvis demonstrates 2 large heterogeneously enhancing pelvic desmoid masses (arrows and asterisk). (b) Follow-up axial fat-suppressed post-gadolinium T1-weighted MR image 6 months after treatment with imatinib shows a mild increase in the size of the anteriorly located mass (arrows) with marked central necrosis and a mild decrease in the size and enhancement of the posterior mass (asterisk) consistent with treatment response.