Parapharyngeal rhabdomyoma.
Rhabdomyoma is a benign tumor of striated muscle origin that is very rare in young children. Review of the world literature revealed 20 cases of extracardiac adult-type rhabdomyoma in the head and neck area. All reported cases have been encapsulated and easily excised. A 22 1/2-month-old girl with a parapharyngeal rhabdomyoma is unique in that her tumor had atypical histology and lacked a capsule; it could not be "shelled-out".
D000367:Age Factors; D005260:Female; D006257:Head / Q000473:pathology*; D006801:Humans; D007223:Infant; D010614:Pharynx; D011859:Radiography; D012207:Rhabdomyoma / Q000000981:diagnostic imaging / Q000473:pathology*