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Polyostotic fibrous dysplasia is a form of fibrous dysplasia affecting more than one bone. [2] Fibrous dysplasia is a disorder where bone is replaced by fibrous tissue, leading to weak bones, uneven growth, and deformity. [3] McCune–Albright syndrome includes polyostotic fibrous dysplasia as part of its presentation. [4]
Fibrous dysplasia is a mosaic disease resulting from post-zygotic activating mutations of the GNAS locus at 20q13.2-q13.3, which codes for the α subunit of the G s G protein-coupled receptor. [13] In bone, constitutive G s α signaling results in impaired differentiation and proliferation of bone marrow stromal cells . [ 14 ]
All patients with known or suspected McCune–Albright syndrome should undergo a screening evaluation for fibrous dysplasia. [18] Nuclear medicine tests such as technetium-99 scintigraphy are the most sensitive way to detect fibrous dysplasia lesions. [19] CT scan of the skull is the most useful test to evaluate craniofacial fibrous dysplasia ...
Emanuel Zayas, 14, suffered from a rare medical condition called polyostotic fibrous dysplasia, an illness which causes the body to replace portions of bones with soft tissue.
Ido Simyoni has fibrous dysplasia, a rare condition where tumors form in bone. He needed 2 surgeries to reconstruct his forehead, prevent infection. At 15, tumors started growing into man’s skull.
Fibrodysplasia ossificans progressiva (/ ˌ f aɪ b r oʊ d ɪ ˈ s p l eɪ ʒ (i) ə ɒ ˈ s ɪ f ɪ k æ n z p r ə ˈ ɡ r ɛ s ɪ v ə /; [1] abbr. FOP), also called Münchmeyer disease or formerly myositis ossificans progressiva, is an extremely rare connective tissue disease in which fibrous connective tissue such as muscle, tendons, and ligaments turn into bone tissue (ossification).
The resorbed bone is replaced and the marrow spaces are filled by an excess of fibrous connective tissue with a marked increase in blood vessels, causing the bone to become hypervascular. The bone hypercellularity may then diminish, leaving a dense "pagetic bone", also known as burned-out Paget's disease. A later phase of the disease is ...
The spongiosa of the stalk continues with the underlying cancellous bone. Fractures within the stalk causes fibroblastic proliferation and formation of a new bone. Development of bursa takes place over the osteochondroma, which is attached to the perichondrium of the cap. Inflammation of the bone is indicated by the bursal wall lined by the ...