A 9-year-old boy with autism was admitted to the hospital because of pain in the hip, rash, and swelling of the gingiva. Three months earlier, pain in his right hip developed, and he eventually refused to walk. Physical examination disclosed no joint swelling, and radiographs of the pelvis and spine were normal. Indomethacin was prescribed; the pain improved, but a petechial rash on the legs and gingival swelling developed.
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