<P> Vasoepididymostomy is often considered one of the most technically challenging operations in the field of urology . The procedure requires anastomosis of a single epididymal tubule ( luminal diameter . 15 -. 25 mm ) to the lumen of the vas deferens ( diameter . 3 -. 4 mm ) , and is reserved for patients with congenital or acquired epididymal obstruction , or patients who have failed previous attempts at surgical reconstruction of the vas deferens . This surgery attaches the vas deferens directly to the epididymis , the coiled tube on the back of each testicle where sperm matures . A vasectomy can cause blockages or a break in the vas deferens or the epididymis . This surgery is used when a vasovasostomy wo n't work because sperm flow is blocked . The vas deferens is connected to the epididymis above the point of blockage . </P>
anastomosis between the epididymis and the vas deferens
Vasoepididymostomy