True about undescended testes
**Core Concept**
Undescended testes, also known as cryptorchidism, refers to a congenital condition where one or both testes fail to descend into the scrotum during fetal development or early infancy. This condition affects approximately 3-4% of full-term male infants and is more common in premature infants.
**Why the Correct Answer is Right**
The primary concern with undescended testes is the increased risk of testicular cancer, which is estimated to be 10-20 times higher than in the general male population. This elevated risk is thought to be related to the abnormal temperature regulation of the testes, which can lead to impaired spermatogenesis and the development of malignant cell populations. The Leydig cells in the testes are responsible for the production of androgens, and their abnormal function may contribute to the increased risk of testicular cancer.
**Why Each Wrong Option is Incorrect**
**Option A:** Undescended testes are associated with an increased risk of testicular torsion. While testicular torsion is a risk in undescended testes, it is not the primary concern.
**Option B:** Cryptorchidism is a common cause of infertility. While undescended testes can lead to impaired spermatogenesis, it is not the primary reason for infertility in these individuals.
**Option C:** Undescended testes are usually bilateral. While bilateral undescended testes can occur, they are not as common as unilateral cases.
**Clinical Pearl / High-Yield Fact**
It is essential to note that undescended testes are often associated with other congenital anomalies, such as hypospadias, inguinal hernias, and renal abnormalities. A thorough physical examination and a detailed medical history are crucial in the evaluation and management of undescended testes.
**Correct Answer:** D.