The chromosome analysis for an unusually tall 13-year-old boy with long slender limbs, clawed toes, pigeon chest, myopia with corectopia, and behavior problems showed a 47, XYY constitution. His dermatoglyphics are characterized by an extremely low ridge count. The diagnosis of Marfan's syndrome is considered.
Dignan PSJ, Kreines K, Soukup S, Warkany J. Arachnodactyly (Marfan's Syndrome) With XYY Karyotype. Am J Dis Child. 1972;124(2):266-270. doi:10.1001/archpedi.1972.02110140116017