Musculoskeletal Key

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…

Fig. 49.1 JBC in the femoral neck. X-ray shows a well-delimited oval osteolytic radiolucent small lesion outlined by a sclerotic rim Fig. 49.2 (a, b) JBC arising in the femoral…

Red marrow of the long bones and axial skeleton is most frequently involved. Less common locations include the skull and craniofacial bones. Involvement of the small bones in hands and…

Fig. 66.1 Paget’s disease of the skull. Radiographic features presenting large ill-defined lytic area with cotton-wool-like opacities Fig. 66.2 Paget’s disease of the mandible with typical periapical dentinal hyperplasia Fig….

Approximately 50 % of the cases in sacrococcygeal bones; nearly 20–40 % in skull base, most commonly in the clivus; and nearly 10–30 % in mobile spine, mainly in the…

Fig. 45.1 Benign PMT. MRI showing a high signal intensity juxtacortical heterogeneous mass in the left femur in a coronal view Fig. 45.2 MRI axial view of same case in…