Megalourethra is a nonobstructive urethral dilatation associated with poor embryogenic development of the corpus spongiosum and occasionally with maldevelopment of the cavernous bodies. The two entities are distinguished arbitrarily: the scaphoid and the fusiform type. Although megalourethra may be an isolated entity, the association with concomitant upper urinary tract abnormalities is rather frequent. Appropriate investigation of the urinary tract is indicated in all patients presenting this urethral anomaly. We describe the case of a 24-old man complaining of erectile dysfunction due to enlarged corpora cavernosa associated with megalourethra. The penile circumference upon erection made vaginal intromission complicated. Surgical correction based on the Nesbitt technique was performed. The postoperative result is satisfactory and normal sexual life is reported.