Musculoskeletal Key

Location: The most frequent sites are the lower limbs, followed by upper limbs and limb girdles. Rare in trunk, head and neck, and hands and feet. Most cases described in…

Location: Lower limb (thigh), retroperitoneum, pelvic region, upper limb, trunk, head, and neck. Deeply located. Clinical: Slow enlarging painless mass, increased skin temperature, telangiectasia, unilateral varicose veins, pulsation, audible bruit,…

Localization: Diaphysis of the long bones. The tibia is affected in 80 % of cases. Followed by the fibula, femur, humerus, ulna, and radius. Exceptional in the soft tissues of…

Location: Trunk, groin, and proximal extremities. Clinical: Nodular or plaque-like painless cutaneous tumor, slowly growing. Diagnosis: A well-defined superficial tumor. On MRI, in T1 usually iso- or hypointense to skeletal…

Clinical: Deep, painless, firm or hard, and poorly circumscribed mass that may be adherent to the skin or bone and that grows insidiously and slowly for several months. Tumor mass…

Location: Foot, ankle, knee, and upper limb. Clinical: Slowly growing, moderate size, painless, globose mass. Diagnosis: On MRI, elliptical, smoothly outlined mass, slightly or markedly hyperintense on T1, white lesion…

Localization: Skeletal muscles of extremities and retroperitoneum. Tumor is deep in 90 % of cases. Clinical: Globose and painless swelling with no characteristic clinical features other than a frequently rapid…

Localization: Tibia and femur. Less frequent in the humerus, rare in the fibula and other long bones. Usually located in the diaphysis, occasionally in the metaphysis. Clinical: Palpable mass and…

Lateral radiograph of the knee and axial T1 MR image. The tumor forms bone, mainly develops in the soft tissues, but starts from the cortex, which has a limited lysis….

Clinical: Clinically, the tumor has an aggressive course, with an expanding soft tissue mass, soft and tender on palpation, with increased local temperature. Pathologic fracture is not uncommon. Imaging: Imaging…