[Respiratory manifestations of Marfan's syndrome].

Marfan's syndrome is a rare genetic disorder caused by a mutation of the gene FBN1, coding for the protein fibrillin-1. Cardiovascular, musculoskeletal and ophthalmic manifestations are the most commonly observed, but minor diagnostic criteria also include pulmonary manifestations. Pneumothorax, frequently relapsing, affects 5 to 11% of patients. Rib cage abnormalities (pectus excavatum or pectus carinatum) and apical blebs may contribute to their occurrence. Treatment does not require any specific procedure but there is an increased risk of recurrence. Pectus excavatum affects up to 60% of the patients, without any functional impairment in most cases. Surgery may be required (using the Nuss procedure) in case of cardiovascular or psychological symptoms. Marfan's syndrome is frequently associated with obstructive sleep apnoea, which may itself contribute to aortic dilatation. Some studies suggest a potential role of craniofacial abnormalities in the pathogenesis of sleep apnea in these patients. Pulmonologists should consider Marfan's syndrome when treating patients for recurrent spontaneous pneumothorax or rib cage abnormalities, since early detection of cardiac abnormalities improves the prognosis significantly.