We present a case of seminal vesicle cyst in a fertile patient. Sporadically appearing hemospermia was the only symptom. We single out thiss pathology and the clinical procedure of this case as being uncommon. Transabdominal echography revealed the presence of the cyst. The T.A.C. did not offer further data. The Deferento vesiculograph was demonstrative. We consider other diagnostic methods and a differential diagnosis is made with other deep pelvis cysts.