Presentation
Vague lump in the right perianal region.
Patient Data
Age: 50 years
Gender: Male
From the case:
Biker's nodule
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Focal signal abnormality within fat in bilateral ischiorectal fossae, more marked on right side, where a central low signal intensity non-enhancing region, suggestive of a mature fibrous tissue. Surrounding wider zone of enhancing granulation tissue is seen.
Case Discussion
Based on the findings, which are clearly away from the anal canal, direct questioning revealed that the patient is an avid bicyclist.
The changes of fibrosis and enhancing edematous soft tissues at pressure points are consistent with chronic pressure-related fibrosis, commonly described as a "Biker's nodule".