Perianal fistula. PELVIS:PROSTATE/SEMINAL VESICLES: Wedge-shaped T2-weighted mild hypointensity in the left medial mid-gland peripheral zone, likely prostatitis in a patient of this age. BLADDER: No significant abnormality noted.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: Thin fluid filled enhancing and restricting fistula tract appears to originate at the right anterolateral aspect of the lower anal canal extending caudally in the intersphincteric space to the right gluteal fold without an associated fluid collection. There is mild adjacent ischioanal phlegmonous inflammation without a liquified drainable fluid collection. OTHER: No significant abnormality noted.
Right-sided intersphincteric fistula extending to the right gluteal fold without an associated fluid collection.