Abstract
Six months and more after unilateral vasectomy in the rat, ipsilateral (same side) and bilateral testicular atrophy are common; this paper investigates their etiology. Ipsilateral atrophy is associated with the presence of a sperm granuloma in the head of the corresponding epididymis and appears to be pressure-mediated. That sperm granulomas at the epididymal head fail to relieve intraluminal pressure in the epididymal duct of the rat was supported by a study of the effects of ligation of that region. No histological evidence was found to indicate that bilateral atrophy was the result of an immune response. A radiological study does not support the idea that compression or displacement of testicular blood vessels by sperm granulomas is responsible for bilateral atrophy.
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