A case of abdominal migration of the testes presenting with azoospermia

31-year-old male was referred to our hospital due to azoospermia. Physical examination revealed impalpable testes in the scrotum, and operative scar presented at lower abdominal midline. Magnetic resonance imaging (MRI) revealed that small testes were located subcutaneously in the lower abdominal midline. Since luteinizing hormone (LH) and follicle stimulating hormone (FSH) were elevated, we diagnosed non-obstructive azoospermia (NOA) due to abdominal migration of the testes. Microscopic testicular sperm extraction (micro-TESE) was performed, however, no sperm were recovered. Pathological diagnosis was Sertoli cell only and no malignant cells were observed. Post-operatively, subjects' hormone levels were unchanged, and testicular tumor markers and computed tomography (CT) were normal. However, renal function gradually deteriorated and a renal transplantation from the farther was carried out eight months after micro-TESE. Attention to the possibility of carcinogenesis of the abdominal migrated testes should be maintained.