From 5/88 to 8/93 148 patients were operated on for obstructive azoosp
ermia using a microsurgical technique. In 68 patients we performed a v
asectomy reversal by vasovasostomy (VT), 42 patients underwent a tubul
ovasostomy (TT), and 8 patients had a VT with contralateral TT. Two pa
tients had implantation of an alloplastic spermatocele, 9 patients had
microsurgical epididymal sperm aspiration (MESA), and 19 patients mic
rosurgical exploration. Patency was achieved in 89% of patients after
VT and in 32% after TT. A pregnancy occurred in 34% after VT and in 13
% after TT. No pregnancy was achieved after MESA or alloplastic sperma
tocele. A microsurgical procedure is necessary for the treatment of co
ngenital or acquired obstructive azoospermia.