Long-term Growth Hormone Therapy in an Adolescent Boy with 45,X/46,XidicY(p11)

A 17-year-old boy with chromosomal mosaicism resulting in a 45,X/46,X,idic(Y)(p11) karyotype came to medical attention at the age of 10 years because of short stature. He was treated with recombinant growth hormone for 6.6 years and has achieved a near final adult height of 172.5 cm. His clinical features included second-degree hypospadias, some stigmata of Turner syndrome, and spontaneous progression through puberty. We report long-term use of growth hormone in a male adolescent with isodicentric Yq.