Testicular volume does not predict germ cell count in patients with cryptorchidism

Area of Science:

• Pediatric Urology
• Endocrinology
• Reproductive Medicine

Background:

• A prepubertal germ cell count below 0.2 per tubule in cryptorchid testes indicates future fertility issues.
• Testicular volume is linked to testicular function and sperm production.
• Accurate assessment is crucial for managing cryptorchidism and selecting patients for hormonal therapy.

Purpose of the Study:

• To evaluate if testicular volume can reliably predict germ cell count in prepubertal cryptorchid testes.
• To determine if testicular volume can replace testicular biopsy in managing cryptorchidism.

Main Methods:

• A study of 723 prepubertal boys with cryptorchidism undergoing orchiopexy and bilateral testicular biopsies.
• Analysis of testicular volume, position, age, and germ cell counts.
• Use of generalized estimating equation to assess the correlation between testicular volume and germ cell count.

Main Results:

• A direct correlation was found between testicular volume and germ cell count.
• However, predictions of germ cell counts from testicular volume showed wide variability.
• Distinguishing between testes with <0.2 and >0.2 germ cells per tubule using volume was unreliable.

Conclusions:

• Testicular volume is not an accurate predictor of germ cell count in cryptorchidism.
• It cannot be used to select patients for post-orchiopexy hormonal therapy.
• Testicular biopsy remains indispensable for the management of cryptorchidism.