
During a routine preschool examination, it was noted that this 4-year-old boy, who weighed 30.8 kg (68 lb), did not seem to rotate his arms. The child's mother stated that she first noticed this 2 or 3 years earlier but thought it was related to her son's obesity. The youngster appears to function normally; he is able to write and play football and basketball. No other family members are known to be similarly affected.
















































































































































































































































































































