[A case of osteochondroma (cartilagenous exostosis) originating from the fourth rib and simulating posterior mediastinal tumor].
D000293:Adolescent; D002812:Chondroma / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging*; D011859:Radiography; D012272:Ribs; D013899:Thoracic Neoplasms / Q000000981:diagnostic imaging*