Ninety-one infertile men with oligospermia and normal FSH serum level have been explored by transrectal ultrasound, biochemical sperm study and spermoculture. Ultrasound data concerning ejaculatory ducts, seminal vesicles and prostate distinguished images evocative of constitutive abnormalities (18 patients, whom sperm fructosis level was low in only one among 12) and images evocative of inflammatory processes (44 patients, whom limited correlations with biological datas were found). Transrectal ultrasound appears as a complement of biological data in infertile man evaluation, offering a better approach of vesiculo-deferentography's indication.