Presentation
Intergluteal swelling with on and off pain and discharge.
Patient Data
Fluid collection in the subcutaneous intergluteal fat plane of low signal on T1, high signal on T2 and T2 fat sat with thick enhanced wall and surrounding inflammatory fat stranding. A sinus tract is noted extending anteroinferiorly and ends blindly at the level of the 2nd coccygeal segment. No secondary ramifications or intersphincteric sepsis were seen.
Case Discussion
MRI features of a pilonidal sinus with surrounding inflammatory fat change.
Pilonidal sinuses result from skin and subcutaneous tissue infections, typically occurring at or near the upper part of the natal (gluteal) cleft of the buttocks.
The main risk factors for developing pilonidal sinuses include male sex, obesity, poor hygiene, sedentary occupations and lifestyle, hirsutism and deep natal cleft.
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