title: Proliferative myositis (a pseudosarcomatous lesion of skeletal muscle) occurring in an infant.
mesh_terms: D001859:Bone Neoplasms / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D007223:Infant; D008297:Male; D009220:Myositis / Q000175:diagnosis* / Q000473:pathology; D012208:Rhabdomyosarcoma / Q000175:diagnosis* / Q000473:pathology