Congenital contractural arachnodactyly

Congenital contractural arachnodactyly (CCA), also known as Beals syndrome or Beals-Hecht syndrome, is a rare inherited connective tissue disorder caused by mutations in the FBN2 gene, which encodes fibrillin-2. This protein plays a critical role in the formation of elastic fibers in connective tissue throughout the body. CCA shares some features with Marfan syndrome but is a distinct condition with its own genetic basis. The hallmark features of CCA include long, slender fingers and toes (arachnodactyly), joint contractures (particularly of the fingers, elbows, knees, and hips), crumpled or folded appearance of the outer ears (a distinctive finding), kyphoscoliosis (curvature of the spine), and a tall, slender body habitus with a narrow body build. Muscular hypoplasia may also be present. Unlike Marfan syndrome, significant cardiovascular complications such as aortic root dilation are less common in CCA, though mild mitral valve prolapse or aortic root enlargement has been reported in some individuals. The joint contractures often improve with age and physical therapy, particularly during childhood. There is no specific cure for congenital contractural arachnodactyly. Management is primarily supportive and symptomatic, focusing on physical therapy and rehabilitation to improve joint mobility and reduce contractures. Orthopedic interventions may be necessary for significant scoliosis or persistent contractures. Cardiac evaluation, including echocardiography, is recommended to monitor for any cardiovascular involvement. Genetic counseling is important for affected individuals and their families. The prognosis is generally favorable, as many of the contractures tend to improve over time, and life expectancy is typically normal.

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