Yq deletion (q11.21) in a H-Y+ azoospermic male

A large deletion of the long arm (q11.21) of chromosome Y without mosaicism was found in a 28-year-old male. The proband has a normal height and normal male habitus but with azoospermia. The occurrence of H-Y+ level, azoospermia and loss of a great portion of euchromatic Yq in the proband is analyzed.