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ANSWER
The correct diagnosis is osteochondritis dissecans of the
radial head, a process that more often affects the capitellum
at this patient's age. Overuse is thought to be the likely
cause of the condition, which often develops in adolescent
athletes.
For further reading, see F. N. Silverman and J. P. Kuhn,
Caffey's Pediatric X-ray Diagnosis, 9th ed., St. Louis,
Mosby-Year Book, 1993, p. 1831.
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