title: Proliferative myositis in a two-year-old child.
abstract: A 2-year-old boy had intermittent pain and mottling of the left thigh. Swelling of the vastus lateralis developed, and a biopsy revealed proliferative myositis. The pathogenesis is unknown, but trauma and ischemia have been implicated. The rarity of proliferative myositis in children, and the possibility of mistaking the lesion for a sarcoma make the case noteworthy.
mesh_terms: D002675:Child, Preschool; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D009132:Muscles / Q000473:pathology*; D009220:Myositis / Q000473:pathology*; D013848:Thigh