Skip to content


Summary of Cryptorchidism
Cryptorchidism is the absence of one or both testes from the scrotum, with the missing testes in the inguinal canal. It is the most common birth defect of the male genitalia. The undescended testis will have impaired spermatogenesis (since spermatozoa develop best at temperatures less than 37° Celsius) but normal testosterone levels if unilateral (Leydig cells are unaffected by temperature). There is an increased risk of developing hypospadias of the penis or a seminoma of the affected testicle. Prematurity is associated with an increased risk of developing the condition. Serum inhibin B levels are decreased, while FSH and LH levels are increased. Testosterone is decreased in bilateral cryptorchidism, but normal in the unilateral variant.



Reproductive system


Male and female reproductive system disorders
Male reproductive system disorders
Female reproductive system disorders
Reproductive system pathology review



0 / 12 complete


1 / 2 complete
High Yield Notes
15 pages


12 flashcards

USMLE® Step 1 style questions USMLE

1 questions

USMLE® Step 2 style questions USMLE

2 questions

A 3250-g (7.2-lb) male newborn is delivered at 40 weeks' gestation to a 23-year-old woman, gravida 1, para 1. She had no complications with pregnancy or delivery. APGAR scores were 9 and 10 at birth and after 5 minutes, respectively. Physical examination shows that his left testes is undescended. There is no change in the testes at his six month follow-up. Which of the following best describes this patient's condition?

External References