Q87.418

Clinical Causes: Genetic mutations in the FBN1 gene, which encodes the protein fibrillin-1, leading to weakened connective tissue. Inheritance in an autosomal dominant pattern, meaning a person with a parent who has Marfan syndrome has a 50% chance of inheriting the disorder. Rare cases caused by new (de novo) mutations with no family history. Genetic variability that influences the severity and specific clinical features of the syndrome.

Key Symptoms: Tall and slender body build with disproportionately long arms, legs, fingers, and toes. Scoliosis or curvature of the spine. Chest deformities such as pectus excavatum (sunken chest) or pectus carinatum (pigeon chest). Flexibility of joints beyond normal limits. Eye problems including lens dislocation, myopia (nearsightedness), and increased risk of retinal detachment. Cardiovascular manifestations such as: - Aortic dilation or aneurysm (enlargement of the aorta). - Aortic regurgitation (leaking of the aortic valve). - Mitral valve prolapse (MVP), which can cause heart murmurs. - Other blood vessel abnormalities, like aneurysms in arteries. Shortness of breath or chest pain related to cardiovascular issues. Fatigue and palpitations in some cases.

Diagnosis Path: Diagnosis often involves a combination of clinical evaluation, family history, and specific tests including: - Echocardiogram: To assess heart valve function and measure the size of the aorta. - Magnetic Resonance Imaging (MRI) or Computed Tomography (CT) scans: To visualize blood vessels. - Genetic testing: To identify mutations in the FBN1 gene. - Ophthalmologic examination: To check for eye-related abnormalities. - Physical examination: Looking for characteristic body features associated with Marfan syndrome. Diagnosis criteria may include the Ghent nosology, which incorporates clinical findings and genetic information to confirm the disorder.

Treatment Protocols: While there is no cure for Marfan syndrome, management focuses on controlling symptoms and reducing the risk of complications. Treatment strategies include: - Regular cardiovascular monitoring, including echocardiograms to track the size of the aorta. - Medications such as beta-blockers or angiotensin receptor blockers (ARBs) to decrease the stress on the aortic wall. - Surgical intervention may be necessary to repair or replace damaged heart valves or to prevent aortic rupture if the aorta enlarges significantly. - Lifestyle adjustments, including avoiding strenuous activities that increase cardiovascular risk. - Comprehensive multidisciplinary care involving cardiologists, geneticists, ophthalmologists, and orthopedic specialists. - Genetic counseling for affected individuals and their families to understand inheritance patterns and risks.