Biker's nodule

Case contributed by Dr Piyush P Siwach

Presentation

Vague lump in the right perianal region.

Patient Data

Age: 50 years
Gender: Male
MRI

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". 

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Case information

rID: 79600
Published: 30th Jun 2020
Last edited: 10th Mar 2021
Inclusion in quiz mode: Included
Institution: Capital Radiology

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