Q87.43

Clinical Causes: M a r f a n s y n d r o m e i s c a u s e d b y a g e n e t i c m u t a t i o n i n t h e F B N 1 g e n e , w h i c h e n c o d e s a p r o t e i n c a l l e d f i b r i l l i n - 1 . T h i s p r o t e i n i s e s s e n t i a l f o r t h e e l a s t i c i t y a n d s t r e n g t h o f c o n n e c t i v e t i s s u e . T h e d i s o r d e r f o l l o w s a n a u t o s o m a l d o m i n a n t i n h e r i t a n c e p a t t e r n , m e a n i n g a p e r s o n w i t h M a r f a n s y n d r o m e h a s a 5 0 % c h a n c e o f p a s s i n g i t t o e a c h c h i l d . S o m e t i m e s , t h e c o n d i t i o n r e s u l t s f r o m a d e n o v o m u t a t i o n , o c c u r r i n g s p o n t a n e o u s l y w i t h o u t a f a m i l y h i s t o r y .

Key Symptoms: Tall and slender build with long limbs and fingers (arachnodactyly) Enlarged or protruding chest (pectus excavatum or pectus carinatum) Scoliosis or abnormal curvature of the spine Prominent or long faces, with a high-arched palate Flat feet or high arches Joint hypermobility, leading to increased flexibility Crowded teeth or dental crowding Dislocated lens or other eye problems such as myopia Stretch marks not related to weight gain or pregnancy Potential skeletal fractures or deformities under significant stress

Diagnosis Path: Diagnosing Marfan syndrome with skeletal manifestations involves a comprehensive clinical evaluation, including physical examination and medical history analysis. Key diagnostic steps include: - Measurement of height and limb proportions - Observation of skeletal features such as chest deformities and spinal curvature - Eye examinations to identify lens dislocation or other issues - Cardiovascular assessments to evaluate for aortic dilation or aneurysms - Genetic testing to identify mutations in the FBN1 gene - Use of established criteria, such as the Ghent nosology, to integrate clinical findings for diagnosis

Treatment Protocols: While there is no cure for Marfan syndrome, management focuses on monitoring and alleviating symptoms to prevent complications: - Regular cardiovascular check-ups to monitor the aorta and heart health - Medications such as beta-blockers or angiotensin receptor blockers to reduce stress on the aorta - Surgical intervention for severe aortic dilation or spinal deformities - Orthopedic treatments like bracing or surgery for severe scoliosis - Eye treatments including corrective lenses or surgical procedures for lens dislocation - Physical therapy to improve joint stability and muscle strength - Lifestyle modifications, including avoiding high-impact sports and activities that put excessive strain on the heart and joints - Genetic counseling for affected individuals and their families