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Fig. 13B —Stromal rectal tumor fistula forming in subperitoneal rectum in 54-year-old woman. Coronal (A) and axial (B) T2-weighted MR images show large heterogeneous rectal mass containing signal voids expanding right side of rectal wall (arrowheads) related to presence of air due to fistula within digestive tract. Right levator ani muscle is not visible, whereas left one is normal (arrow, A). No lymph node enlargement is seen.