Biker's nodule refers to a mass in the perineum that occur in cyclists.
Epidemiology
In keeping with bicycling being a male dominated recreational activity, the pathology is most commonly found in young-middle aged males, more commonly during first 6 to 12 months of taking up the sport.
Pathology
Chronic pressure and friction in perineal region between a bicycle saddle and inferior ischial tuberosities can result in delamination changes of fat in the ischiorectal fossae. Over a longer term in some cyclists, granulation tissue formation and fibrosis ensues.
Radiographic features
Depending on the stage at which imaging is performed, the degree of edema, inflammation or fibrosis can vary, and so do imaging findings.
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