Follow-up of boys with unilateral compensatory testicular hypertrophy.

Of a total of 148 boys with unilateral compensatory testiculary hypertrophy (CTH) diagnosed at our clinic, 30 were followed for many years throughout puberty. These boys underwent the pubertal stages fo pubic hair development in a normal manner, including penile growth. The basal plasma levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) of the boys with CTH showed a wider range than those of normal boys. Even in prepuberty the mean basal plasma FSH levels were significantly higher than those of normal boys, as was the peak FSH response to intravenous LH-releasing hormone. In puberty stage 4 the mean plasma LH levels were also higher than normal. Plasma testosterone levels were within the normal range in pubertal stages 1 to 4, but in stage 5 the mean basal level and response to stimulation with human chorionic gonadotropin were significantly lower than normal. Among seven spermatograms performed, five showed oligospermia and two showed azoospermia. It is concluded that compensatory hypertrophy of one testis does not seem able to prevent testicular insufficiency in adulthood.