Ultrasound manifestations and clinical features of nonpalpable testis in children

To explore the value of ultrasound in the preoperative diagnosis of nonpalpable testis (NPT) in children. A retrospective study of 254 cases with NPT from May 2017 to December 2021. The preoperative ultrasound examination results were compared with the surgical exploration and pathological results. There were 254 cases (312 testes) NPT has got surgery in our centre. The surgical age were from 6 month to 12 years old, the median age was 2.33 years. There were 103 cases (136 testes) diagnosed as intra-abdominal testis (IAT) by preoperative ultrasound, and 80 cases (103 testes) of extra-abdominal testis (EAT), 71 cases (73 testes) of non-viable testis (NVT). There were 102 cases (135 testes) consistented as IAT by the diagnostic laparoscopy, the preoperative ultrasound's coincidence of IAT was 99.02%. There were 80 cases (103 testes) consistented as EAT by the diagnostic laparoscopy, the preoperative ultrasound's coincidence rate was100%. There were 62 cases (62 testes) consistented as NVT by the diagnostic laparoscopy, there were 9 cases (11 testes) misdiagnosed, the preoperative ultrasound's coincidence rate was 84.9%. Ultrasound can provide valuable information for the preoperative diagnosis of children with nonpalpable testicles, and especially good at identifying the EAT and IAT with normal testicular morphology.