Musculoskeletal Key

Fig. 48.1 (a, b) ABC in the upper metaphysis of a humerus. Lytic, rapidly expansible lesion Fig. 48.2 (a, b) Two months follow-up shows a rapid ballooned expansion of the…

Sites of Involvement Monostotic and polyostotic forms arise more frequently in long bones (proximal femur, tibia, humerus) and craniofacial bones – especially in the jaws (the maxilla is more involved…

Age Tumor First and second decade Nonossifying fibroma Unicameral bone cyst Aneurysmal bone cyst Chondroblastoma Langerhans cell histiocytosis Osteosarcoma Ewing sarcoma Third through fifth decade Giant cell tumor Lymphoma Parosteal…

Primary osteosarcoma: For the most part they originate in the long bone metaphysis (90 %), especially in the knee region and proximal humerus (locations with the most proliferative growth plates)….

Fig. 47.1 Simple bone cyst in its most common site. Well outlined centrally and symmetrically located metaphysiodiaphyseal lucency. The cortices are expanded and thinned. The lesion is not wider than…

Sites Lower extremity: quadriceps and gluteus muscles Upper extremity: brachialis muscle Clinical Symptoms and Signs First stage – pain or tenderness, hours or days after the injury: Rarely localized erythema…

One-third in spine: In vertebrae, osteoblastoma tends to involve the posterior elements. Most common locations in the spine are, by frequency, cervical, lumbar, thoracic, and sacral. One-third in tubular bones:…

Sites of Involvement It has a major preference for the epiphysis of the long bones, about half of the cases occurring about the knee: distal femur, proximal tibia, and proximal…

Fig. 51.1 Metaphyseal fibrous defect (MFD) of the distal femur. (a, b) Anteroposterior and lateral X-ray showing a large radiolucent lesion, with well-defined sclerotic border. (c) Axial CT scan showing…

More than 70 % in long tubular bones. Most frequent sites: upper end of femur neck and trochanter and lower end of femur, tibia, and humerus. Metacarpal, metatarsal, and phalanges…