osteosarcoma

Definition

Intermediate grade chondroblastic osteosarcoma arising from surface of long bones

Epidemiology

Extremely rare

- 1% of all osteosarcomas

- 25% of surface osteosarcomas

Age 15-25

Location

Typically anterior proximal tibia

- diaphysis of major long bones

- humerus

Pathology

DDx

Primary

Benign

Osteoid Osteoma

Osteoblastoma

Osteochondroma

ABC

Hemangioma

Giant Cell tumour

EG

Malignant

Chordoma

Ewings

Osteosarcoma

Chondrosarcoma

Lymphoma

Multiple myeloma

Secondary

Leukaemia