A 45,X/46,Xidic(Y)(q1 1.2) mosaicism was found in a 4-year-old boy. The cli
nical appearance was characterized by bilateral cryptorchidism, penoscrotal
hypospadias, short penis, and coarctation of the aorta. The latter is the
only abnormality also seen in Turner syndrome. A biopsy of the gonads revea
led normal prepubertal testicular tissue. A chromosome analysis in all boys
with penoscrotal, scrotal, or perineal hypospadias and a thorough examinat
ion of the heart in children with 45,X/46,XY mosaicism are recommended.