Abstract
This paper is concerned with a study of 123 patients who had complete azoospermia and in whom either exploration of the scrotal content or corrective surgery was performed. These patients were, of course, selected from a larger group of persons seeking the cause and cure of their sterility. Some of these patients were seen as long as 33 years ago and some during the past few months. CAUSES OF STERILITY Mechanical obstruction or lack of continuity of the vasoepididymal ductal system is the result of (1) incomplete or improper development of the ductal system itself, (2) obstruction in the epididymis or in the vas as a result of postinflammatory constriction and occlusion of the lumen or the ejaculatory ducts, and (3) inadvertent or purposeful division of the vasa. The records show that, in these 123 patients, azoospermia, as nearly as it could be defined, was due to many factors. 1.

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