Periosteal chondroma.
D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000000981:diagnostic imaging*; D002648:Child; D002675:Child, Preschool; D002812:Chondroma / Q000000981:diagnostic imaging*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging; D008297:Male; D010521:Periosteum / Q000000981:diagnostic imaging*; D011859:Radiography; D011884:Radius / Q000000981:diagnostic imaging; D013977:Tibia / Q000000981:diagnostic imaging