Genetic and histopathological analysis of transverse testicu
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The patient was naturally delivered at 39 weeks, 0 days via normal labor, and had no siblings. The birth weight was 2426 g, and Apgar scores were 9(1) and 9(5). At birth, the baby was diagnosed with bilateral nonpalpable testes and hypospadias. Chromosomal and genetic tests showed that the karyotype was 46, XY and that the SRY gene was positive. Thus, the baby was brought up as a boy. At 4 months old, his right testis was palpable in his right scrotum. Because his left testis was still nonpalpable, he was referred to our hospital. Ultrasonography and magnetic resonance imaging (MRI) revealed that the left testis was located around his right groin. Thus, the author diagnosed TTE and performed laparoscopic left orchiopexy at 15 months of age.

According to our previous report, conventional laparoscopy uncovers the left abdominal testis just above the right internal ring. The right processus vaginalis was opened. They could not confirm the existence of any Müllerian duct derivatives. After sufficient mobilization, the left testis was delivered into the subdartos pouch of the left scrotum. The left testis was fixed in the scrotum using a 5–0 polyglactin suture, and at that time, a testicular biopsy was also performed with permission from the patient’s parents. Subsequently, at 22 months old, the author performed the repair of hypospadias. There were no postoperative complications, and both testes were located in the lower scrotum. Both testes were palpable in their respective scrotums without testicular ascent or atrophy at 8 years postoperatively.