MedGen

A rare soft tissue sarcoma characterized by a malignant, fibroblastic lesion with variably myxoid stroma, pleomorphism, and a distinctively curvilinear vascular pattern. The majority of tumors arise in the limbs including the limb girdles, more often in dermal/subcutaneous tissues than in the underlying fascia and skeletal muscle, and usually present as a slowly growing, painless mass. Depth of the lesion and tumor grade do not influence the high rate of local recurrence, while the percentage of metastasis and tumor-associated mortality are much higher in deep-seated and high-grade neoplasms. [from ORDO]

Aneurysmal bone cysts are benign primary or secondary lesions that are rapidly expansive and locally destructive. They are located in the posterior elements of the vertebral column or the flat or long bones of patients under 30 years of age. The cysts are blood-filled and separated by septa containing spindle cells, trabeculae of bone, and osteoclastic giant cells (Biesecker et al., 1970). Histopathologically and radiographically, aneurysmal bone cysts are similar to telangiectatic osteosarcoma from which they must be differentiated. [from OMIM]

FBN1-related Marfan syndrome (Marfan syndrome), a systemic disorder of connective tissue with a high degree of clinical variability, comprises a broad phenotypic continuum ranging from mild (features of Marfan syndrome in one or a few systems) to severe and rapidly progressive neonatal multiorgan disease. Cardinal manifestations involve the ocular, skeletal, and cardiovascular systems. Ocular findings include myopia (>50% of affected individuals); ectopia lentis (seen in approximately 60% of affected individuals); and an increased risk for retinal detachment, glaucoma, and early cataracts. Skeletal system manifestations include bone overgrowth and joint laxity; disproportionately long extremities for the size of the trunk (dolichostenomelia); overgrowth of the ribs that can push the sternum in (pectus excavatum) or out (pectus carinatum); and scoliosis that ranges from mild to severe and progressive. The major morbidity and early mortality in Marfan syndrome relate to the cardiovascular system and include dilatation of the aorta at the level of the sinuses of Valsalva (predisposing to aortic tear and rupture), mitral valve prolapse with or without regurgitation, tricuspid valve prolapse, and enlargement of the proximal pulmonary artery. Severe and prolonged regurgitation of the mitral and/or aortic valve can predispose to left ventricular dysfunction and occasionally heart failure. With proper management, the life expectancy of someone with Marfan syndrome approximates that of the general population. [from GeneReviews]

Complex regional pain syndrome type 1 (CRPS1) is a form of complex regional pain syndrome (see this term) in which the pain is disproportionate to any known inciting event and is characterized by continuous pain, allodynia, or hyperalgesia as well as edema, coloration (changes in skin blood flow), or abnormal sudomotor activity in the region of pain. Onset of CRPS1 symptoms may occur within a few days to a month after an injury or trauma to the affected limb. [from ORDO]

A disorder which is not a natural consequence or progression of any pre-existing disorder, resulting from a diagnostic procedure or any form of therapy that is not an intended or expected outcome of its use. [from SNOMEDCT_US]