Musculoskeletal Key

Localization: (a) Superficial (frequent): in the subcutaneous tissue of the back, shoulder, neck, and proximal extremities. (b) Deep (rare): within or between muscles or adherent to bone, tendons, joints or…

T2 MR images, coronal of the thigh and sagittal of the foot. The thigh lesion has a low signal and infiltrates the muscles, whereas one in the foot is nodular…

Location: Flat and short bones of the trunk: skull (parietal, frontal site), ribs, pelvis, vertebral body, clavicle, and scapula. Among long bones: proximal half of the femur, humerus, and tibia…

Localization: Proximal femur, pelvis, proximal humerus, scapula, and proximal tibia. In long bones, it starts metaphyseal extending as far as half or more of the entire bone. Clinical: Deep, discontinuous,…

Location: Typically located in the long bone metaphysis, it can invade the epiphysis, especially in adults. Preferred sites proximal tibia (30 % of cases), small bones of the foot, and…

Location: Proximal femur, pelvis, and proximal humerus. Clinical: On a history of long duration with moderate symptoms, a rapid progression of pain and swelling occurs. Pathologic fractures frequent. Imaging: On…

Localization: The most frequent locations are femur, tibia, humerus, and pelvis. Usually located in the meta-diaphysis, it may invade the epiphysis or be multicentric. Clinical: In low-grade tumors, there is…

Round- to ovoid-shaped cells, similar to Ewing sarcoma cells, organized in sheets and nests, with osteoid matrix Selected Bibliography Bertoni F, Present D, Bacchini P, Pignatti G, Picci P, Campanacci…

Localization: It is most commonly localized in the long bones, femur, tibia, and humerus. It prevails in the metaphyses and metaepiphyses, although a purely diaphyseal location may be seen. There…

Localization: It prevalently occurs in the appendicular skeleton, while it is rare in the trunk, with the exception of the spine (mostly localized in the posterior arch). In the limbs,…