Parosteal osteosarcoma of a metatarsal with intramedullary invasion.
A 70-year-old man presented with increasing swelling of 2 years' duration, on the dorsal aspect of the forefoot. Imaging studies revealed a heavily calcified surface lesion of bone with early invasion of the underlying second metatarsal. Both imaging findings and the subsequent resection histology were consistent with a parosteal osteosarcoma, which is particularly rare at this site and at this age. The differential diagnosis of a mineralizing surface lesion of bone arising in the foot is discussed.
Johnson
K
K
Department of Radiology, Royal Orthopaedic Hospital, Birmingham, UK.
Davies
A M
AM
Mangham
D C
DC
Grimer
R J
RJ
D000368:Aged; D000671:Amputation, Surgical; D001706:Biopsy; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008682:Metatarsal Bones / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D009361:Neoplasm Invasiveness; D012516:Osteosarcoma / Q000175:diagnosis* / Q000601:surgery; D010521:Periosteum / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography