An abnormally tall 11 year old with normal mentation is most likely to have which of the following syndromes?

Ans. D. Marfan SyndromeMarfan syndrome is an autosomal dominant connective tissue disorder consisting of tall stature, arachnodactyly, thin extremities, increased arm span, and decreased upper body: lower body segment ratio. Additional abnormalities include ocular abnormalities (e.g., lens subluxation), hypotonia, kyphoscoliosis, cardiac valvular deformities, and aortic root dilation.