Most common cause of delayed pubey in males is
Constitutional delay in growth and pubey is the most common cause of delayed pubey in boys.These boys have growth retardation and delayed bone age.Family history of delayed pubey is present.Gonadotropin levels are prepubeal similar to hypgonadotropic hypogonadism. Reference : OP Ghai ,eseential paediatrics 8 th edition, page no 538 .
Kallaman syndrome
Klienfelter syndrome
Constitutional
Prader-willi syndrome
Endocrinology