Patient selection: > 5,000 km per year off-road biking (>= 2 hours per day for >= 6 days per week)
Types of lesions in extreme mountain bikers:
(1) lesions associated with acute trauma (hematoma, etc)
(2) persistent lesions
One or more persistent lesions were identified during ultrasonography in 94% of mountain bikers.
About half of the riders had intermittent scrotal tenderness or discomfort; all of these had scrotal findings. Most riders who were asymptomatic had one or more scrotal findings.
Lesions seen in most mountain bikers (> 80%):
(1) scrotal calculi
Lesions seen in many mountain bikers (25 - 50%):
(1) epididymal cyst
(2) epididymal calcifications
(3) testicular calcifications
(4) hydroceles
Lesions seen in a few mountain bikers (1-11%):
(1) varicocele
(2) testicular microlithiasis
