[Ultrasonic diagnosis of undescended testes. Methods and possibilities].

83 boys with 123 empty hemiscroti were assessed by clinical examination and ultrasound. After repeated clinical examination with the patient in general anesthesia 60 undescended testes were operated. We present the technical aspects of examination of undescended testes by ultrasound. When testicular position as established by ultrasound was compared with intraoperative finding position, ultrasound had a very high sensitivity, specificity and accuracy for testes positioned distal to the internal ring. The anatomical position of the testis at sonography and the patient's age provide objective evidence to discern retractile and truly undescended testes.