Thirty-eight testicular hydroceles were treated by injection with 0.2-0.4 g of bismuth phosphate. The follow-up was completed in 32 cases, 17 (53%) of which showed complete regression although one patient had to wait 24 months for full regression. Eight patients (25%) showed clinical improvement and one patient (3%) had residual scrotal tenderness after otherwise successful treatment. Six patients (19%) did not improve and were treated surgically. The method may present an alternative to surgery in elderly patients with testicular hydrocele.