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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Mutations in the TGFB1 gene cause Camurati-Engelmann disease. The TGFB1 gene provides instructions for producing a protein called transforming growth factor beta-1 (TGFβ-1). The TGFβ-1 protein triggers chemical signals that regulate various cell activities, including the growth and division (proliferation) of cells, the maturation of cells to carry out specific functions (differentiation), cell movement (motility), and controlled cell death (apoptosis).</p><p>The TGFβ-1 protein is found throughout the body but is particularly abundant in tissues that make up the skeleton, where it helps regulate the formation and growth of bone and cartilage, a tough, flexible tissue that makes up much of the skeleton during early development. TGFβ-1 is involved in different processes in other tissues.</p><p>The TGFB1 gene mutations that cause Camurati-Engelmann disease result in the production of an overly active TGFβ-1 protein. This abnormal TGFβ-1 protein activity causes an increase in signaling, which leads to more bone formation. As a result, the bones in the arms, legs, and skull are thicker than normal, contributing to the movement and neurological problems often experienced by individuals with Camurati-Engelmann disease.</p><p>Some individuals with Camurati-Engelmann disease do not have an identified mutation in the TGFB1 gene. In these cases, the cause of the condition is unknown.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/camurati-engelmann-disease/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Camurati-Engelmann disease?"},{"bodyHtml":"<p>The thick limb bones can lead to bone pain and muscle weakness in the arms and legs and cause individuals with Camurati-Engelmann disease to tire quickly. Bone pain ranges from mild to severe and can increase with stress, activity, or cold weather. Leg weakness can make it difficult to stand up from a seated position and some affected individuals develop a waddling or unsteady walk. Additional limb abnormalities include joint deformities (contractures), knock knees, and flat feet (pes planus). Swelling and redness (erythema) of the limbs and an abnormal curvature of the spine can also occur.</p><p>Individuals with Camurati-Engelmann disease may have an unusually thick skull, which can lead to an abnormally large head (macrocephaly) and lower jaw (mandible), a prominent forehead (frontal bossing), and bulging eyes with shallow eye sockets (ocular proptosis). These changes to the head and face become more prominent with age and are most noticeable in affected adults. In about a quarter of individuals with Camurati-Engelmann disease, the thickened skull increases pressure on the brain or compresses the spinal cord, which can cause a variety of neurological problems, including headaches, hearing loss, vision problems, dizziness (vertigo), ringing in the ears (tinnitus), and facial paralysis.</p><p>The degree of hyperostosis varies among individuals with Camurati-Engelmann disease as does the age at which they experience their first symptoms.</p><p>Other, rare features of Camurati-Engelmann disease include abnormally long limbs in proportion to height, a decrease in muscle mass and body fat, delayed teething (dentition), frequent cavities, delayed puberty, a shortage of red blood cells (anemia), an enlarged liver and spleen (hepatosplenomegaly), thinning of the skin, and excessively sweaty (hyperhidrotic) hands and feet.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/camurati-engelmann-disease\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"camurati-engelmann-disease","sourceDocuments":[{"name":"Camurati-Engelmann disease","reviewed":"2017-11","sections":{"causes":{"fetchedAt":"2026-10-20T20:20:00.863150+00:00","label":"Causes","pageSha256":"ad1a1b95827e22068f9e7efa0bb12f8d0698e2e5e6e8e378a3eaf270c5c491de","sourceUrl":"https://medlineplus.gov/genetics/condition/camurati-engelmann-disease/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/camurati-engelmann-disease"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Camurati-Engelmann disease"},"schemaVersion":1}