Fibrous dysplasia (Rind sign)
Last updated by drk on 09/28/2009 03:00 AM (Read: 13372 times)
Classically, fibrous dysplasia lesions are intramedullary, expansile, and well defined lucent lesion in the diaphysis or metaphysic ("long lesion in long bone"). Although endosteal scalloping may be present, a smooth cortical contour is always maintained (absence of periosteal reaction). Lesions show varying degrees of hazy density with a ground-glass quality, although some may appear almost completely radiolucent or sclerotic. The lesion may be surrounded by a layer of thick, sclerotic reactive bone termed a rind. The classic rind is most commonly seen in proximal femur.
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Erosive (inflammatory) osteoarthritis
Last updated by drk on 09/21/2009 03:00 AM (Read: 14050 times)
Erosive osteoarthritis is typically bilateral and symmetrical, and it occurs in the interphalangeal, particularly distal interphalangeal, joints of the hands. The disease most commonly occurs in postmenopausal women, and it may be hereditary. The erosions are centrally located in contrast to the marginal erosions in rheumatoid arthritis. Joints assume a gull-wing configuration, with central erosions flanked by raised lips of bone.
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Tuft fracture in the ring finger - Bone sarcoidosis
Last updated by drk on 09/20/2009 06:11 PM (Read: 41320 times)
Skeletal involvement is seen in approximately 5% - 10% of patients with sarcoidosis. The phalanges in the hands and feet are most frequently affected. Radiologic features are characterized by cystic or lacelike appearance which is bilateral in distribution, usually at the ends in small bones (hands and feet). The articular spaces are usually intact, unless extensive lesions (punched-out lesions) develop. Calcification is absent. A subcutaneous soft-tissue mass or tenosynovitis may also be present.
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Absent semimembranosus muscle
Last updated by drk on 07/28/2009 03:00 AM (Read: 6550 times)
Semimembranosus muscle may be reduced or absent, quite large or double in which case arising mainly from the sacrotuberous ligament giving a slip to the femur or adductor magnus.
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Insufficiency fracture of sacrum and iliac bone
Last updated by drk on 07/16/2009 04:49 PM (Read: 15156 times)
Insufficiency fracture is a subgroup of stress fracture caused by the effect of normal or physiologic stress upon weakened bone.
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