The patient had four years of infertility with his right testis in an inguinal canal. Seminal analysis showed very occasional spermatozoa (< 100,000/ml), although obstruction was excluded. Testicular biopsy revealed maturation arrest. Although more spermatozoa were present when compared with Case 3 (Fig. 11.42), none can be seen in this field. H&E stain. By courtesy of Dr WE Kenyon.