Musculocutaneous nerve injury in a high school pitcher.

: Nontraumatic musculocutaneous nerve palsy is a rare injury that can occur in throwers. We present a case of musculocutaneous nerve injury in a high school pitcher, which has rarely been previously reported. The unique electromyography findings add to the overall spectrum seen with musculocutaneous nerve injuries in throwers. Sensory abnormalities may not be present at initial evaluation, but rather weakness or pain of the biceps is the most common presenting concern. Electrodiagnostic evaluation is paramount for confirmation of diagnosis, yet the timing of this study is critical for its accuracy. Rest and progressive physical therapy remain as the current treatment of choice. Resolution of symptoms, although time consuming, is complete in the majority of cases, including ours.