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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>ECCL can result from mutations in the FGFR1 gene, which provides instructions for making a protein called fibroblast growth factor receptor 1 (FGFR1). This receptor interacts with proteins called fibroblast growth factors (FGFs) to trigger signaling within cells. Signaling via the FGFR1 protein is involved in many critical processes, such as cell division and the regulation of cell growth and maturation. This signaling is important for the normal development and growth of several parts of the body, including the brain.</p><p>The FGFR1 gene mutations that cause ECCL arise randomly in one cell during the early stages of development before birth. As cells continue to grow and divide, some cells will have the mutation and others will not. This mixture of cells with and without a genetic mutation is known as mosaicism. In cells with an altered FGFR1 gene, the resulting FGFR1 protein is overactive, triggering abnormal signaling that affects cell growth and division. Researchers are studying how these changes in signaling lead to the growth of noncancerous tumors and the other features of ECCL.</p><p>In some people with ECCL, no FGFR1 gene mutation has been identified, and the cause of the disease is unknown. Other genetic changes are under study as possible causes of this condition.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/encephalocraniocutaneous-lipomatosis/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Encephalocraniocutaneous lipomatosis?"},{"bodyHtml":"<p>A hallmark feature of ECCL is a noncancerous tumor under the scalp covered by a smooth, hairless patch of skin. This type of tumor, called a nevus psiloliparus, is made up of fatty tissue. Some people with ECCL also have noncancerous tumors under the skin elsewhere on the head or face. Many have small flaps of skin called skin tags on the eyelids and around the eyes. Hair loss (alopecia), thin or missing patches of skin on the scalp (dermal hypoplasia or aplasia), and changes in skin coloring (pigmentation) are also possible.</p><p>The most common eye abnormality in ECCL is a noncancerous growth called a choristoma. These growths can be present in one or both eyes and may affect vision.</p><p>About two-thirds of people with ECCL have noncancerous fatty tumors inside the brain or around the spinal cord. These tumors are called intracranial lipomas and intraspinal lipomas, respectively. Affected individuals also have an increased risk of developing a type of brain cancer called a glioma. The brain and spinal cord abnormalities associated with ECCL can cause seizures, abnormal tensing of the muscles, and intellectual disability ranging from mild to profound. However, about one-third of affected individuals have normal intelligence.</p><p>Other kinds of growths may also occur in people with ECCL, including noncancerous jaw tumors.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/encephalocraniocutaneous-lipomatosis\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"encephalocraniocutaneous-lipomatosis","sourceDocuments":[{"name":"Encephalocraniocutaneous lipomatosis","reviewed":"2016-11","sections":{"causes":{"fetchedAt":"2026-10-20T20:21:10.541871+00:00","label":"Causes","pageSha256":"ca0a91010ff6c780e05dc29498ad0ce91475d2469fdd465929d576ed9197c75e","sourceUrl":"https://medlineplus.gov/genetics/condition/encephalocraniocutaneous-lipomatosis/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/encephalocraniocutaneous-lipomatosis"}],"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":"Encephalocraniocutaneous lipomatosis"},"schemaVersion":1}