MRI
Associated with the right sciatic nerve (tibial portion) there is a mass that is homogeneous low T1, heterogeneous high T2 signal, with heterogeneous postcontrast enhancement. It lies at the level of the ischial tuberosity.
Skin marker has been placed in the left subgluteal region, where there is a cutaneous lesion, which is low T1, high T2 with postcontrast enhancement.