Isolated long-head triceps brachii tendon avulsion in a surfer detected at MR imaging.

We report a case of a rare isolated avulsion of the long head of the triceps tendon detected at magnetic resonance (MR) examination occurring in a 35-year-old male surfer. Isolated long-head triceps tendon avulsions have rarely been reported and, to our knowledge, the MR findings have not previously been described in the world literature.