Microscopic failure of urogenital union.
D000328:Adult; D004822:Epididymis / Q000002:abnormalities* / Q000473:pathology; D005826:Genetics, Medical; D006801:Humans; D007248:Infertility, Male; D007713:Klinefelter Syndrome; D008297:Male; D013737:Testis / Q000002:abnormalities*