Musculoskeletal Key

Location: Epiphysis or apophysis of long bones (proximal femur and humerus), flat, and short bones. Clinical: Modest pain. Imaging: On x-ray, like a chondroblastoma. Osteolytic lesion with small calcifications, sharp…

Radiograph at onset and two months later, bone scintigraphy. Lytic heterogeneous broken lesion involving the epiphysis and metaphysis. The thick lamellar cortex indicates a preexisting Paget disease, confirmed by widespread…

Localization: Osteoblastoma shows evident predilection for the vertebral column (posterior arch) and the sacrum, but it may occur in any skeletal site. Clinical: In the spine, it presents symptoms similar…

Localization: Desmoid fibroma is more frequent in the mandible, long bones, and pelvis. In the long bones, it is more often observed in the meta-diaphysis, but it may be diaphyseal….

Location: Usually at the end of long bones (femur, tibia, humerus), involving the epiphysis, both the epiphysis and the metaphysis, or, less frequently, an apophysis. Exceptionally, it can be purely…

High-grade OS varieties 90 % Classic osteosarcoma 75 Telangiectatic 6/7 Of jaw bones 4 Secondary 4

Localization: Any osseous segment may be affected, but the most common sites are the metadiaphyses of the long bones and the spine. Clinical: Pain and swelling generally of less than…

Location: Long bones, metaepiphyseal, and eccentrical: distal femur, proximal tibia, and distal radius (65 % of the cases). Rare in the sacrum and pelvis. When occurring in long bones before…