A condition characterized by the dilated tortuous veins of the spermatic cord with a marked left-sided predominance. Adverse effect on male fertility occurs when varicocele leads to an increased scrotal (and testicular) temperature and reduced testicular volume. The disease is varicocele (MONDO_0001498, a Monarch Disease Ontology term). Also known as: scrotal varices, scrotum varicose disease, varicose disease of scrotum.