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Jansen's metaphyseal chondrodysplasia (JMC) is a disease that results from ligand-independent activation of the type 1 of the parathyroid hormone receptor, due to one of three reported mutations (activating mutation). [1] JMC is extremely rare, and as of 2007 there are fewer than 20 reported cases worldwide.
Metaphyseal dysplasia, or Pyle disease, [3] is a disorder of the bones. It is a rare disease in which the outer part of the shafts of long bones is thinner than normal and there is an increased chance of fractures .
Metaphyseal chondrodysplasia Schmid type is a type of chondrodysplasia associated with a deficiency of collagen, type X, alpha 1. [2] [3] [4]Unlike other "rickets syndromes", affected individuals have normal serum calcium, phosphorus, and urinary amino acid levels.
Such manifestations usually result from disruption of physeal growth especially that osteochondromas typically arise at the metaphyseal ends of long bones in close proximity to the physis. [ 1 ] [ 5 ] Intra-articular osteochondromas of the hip can induce limitation of range of motion, joint pain and acetabular dysplasia. [ 2 ]
Verloes Van Maldergem Marneffe syndrome, also known as microspherophakia-metaphyseal dysplasia is a very rare genetic disorder which is characterized by flattened and deformed vertebrae, developmental delay, dysplasia of the epiphyses and metaphyses, lens coloboma and dislocation, microspherophakia, nearsightedness, retinal detachment, and spinal stenosis.
Metaphyseal tumors or lesions include osteosarcoma, chondrosarcoma, fibrosarcoma, osteoblastoma, enchondroma, fibrous dysplasia, simple bone cyst, aneurysmal bone cyst, non-ossifying fibroma, and osteoid osteoma. [5] One of the clinical signs of rickets that doctors look for is cupping and fraying at the metaphyses when seen on X-ray.
Ghosal hematodiaphyseal dysplasia, is a rare, autosomal recessive disease, characterized by diaphyseal dysplasia and metaphyseal dysplasia of the long bones and refractory anemia. [ 2 ] [ 3 ] [ 1 ] It is associated with a deficiency of Thromboxane-A synthase , [ 4 ] which produces Thromboxane A2 .
Other skeletal abnormalities include metaphyseal dysostosis (45% of patients), thoracic dystrophy (rib cage abnormalities in 46% of patients) and costochondral thickening (shortened ribs with flared ends in 32% of patients). Skeletal problems are one of the most variable components of SDS, with 50% affected siblings from the same family ...