Retrograde ejaculation caused by incomplete paralysis of pelvic nerve.

A case of retrograde ejaculation is reported. Initially, it was considered idiopathic, but various examinations revealed subclinical neurogenic bladder with hypotonic detrusor and normal external urethral sphincter. This was due to incomplete paralysis of the pelvic nerve and the normal activity of the pudendal nerve. Normal antegrade ejaculation was obtained by bilateral pudendal nerve block. Some cases of idiopathic retrograde ejaculation are ascribable to neurogenic bladder; and urodynamic examination is essential in the diagnosis of this disease.