Evaluate for sacral mass. PELVIS:PROSTATE/SEMINAL VESICLES: No significant abnormality noted.BLADDER: No significant abnormality noted.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: A skin marker was placed along the dorsal aspect of the sacrum. Deep to the skin marker is an encapsulated low T1 and high T2 weighted signal lesion extending in the subcutaneous fat dorsal to the sacrum measuring 1.4 x 0.9 cm in maximal axial cross section and 7.3 cm in craniocaudal dimension (series 701/29 and series 501/34), compatible with a pilonidal sinus cyst. There is mild surrounding inflammatory changes of the soft tissues with T2 weighted fat stranding and mild postcontrast enhancement suspicious for superinfection. The lesion does not extend to the adjacent bony structures.There is a T2-weighted hyperintense tract extending from approximately the 6:00/dorsal aspect of the anal canal extending in the left gluteal fold suspicious for a fistulous tract (series 701/6 and series 901/6) with possible mild enhancement. No discrete abscess.There is very mild T2-weighted/STIR focal hyperintensity within the left iliac bone adjacent to the sacroiliac joint. No significant signal abnormality on the corresponding sacral side of the joint. No significant sacroiliac joint fluid. Otherwise the bone marrow signal intensity of the visualized osseous structures is unremarkable.Nonspecific subcentimeter inguinal lymph nodes.Please note that this study was not protocoled for the detailed evaluation of the acetabular labra.OTHER: No significant abnormality noted.
1.Suspected superinfected pilonidal sinus extending 7.3 cm in the craniocaudal dimension.2.6:00/dorsal perianal transsphincteric fistulous tract extending along the left gluteal fold.3.Very mild nonspecific left iliac bone T2-weighted/STIR hyperintensity.