What is the Difference Between Undescended Testis and Retractile Testis?

The main difference between undescended testis and retractile testis lies in their position and mobility. Here are the key differences:

• Undescended Testis (Cryptorchidism): In this condition, one or both testes remain in the abdomen or the groin instead of descending into the scrotum. Undescended testis can impair sperm production later in life and increase the risk of testicular cancer. About 50% of full-term newborn boys have undescended testicles, with about two-thirds of them descending on their own by 4 months of age.
• Retractile Testis (Hypermobile Testes): Retractile testes have descended into the scrotum but can move back (retract) into the inguinal canal easily as a reflex response to stimulation. This condition is common, affecting about 80% of boys between ages one and 11. Retractile testes do not lead to cancer or other complications. The problem of a retractile testis often resolves itself before or during puberty.

In summary, an undescended testis is one that never entered the scrotum, while a retractile testis can move back and forth between the scrotum and the groin. Undescended testes can cause complications, whereas retractile testes are generally not a cause for concern.

Comparative Table: Undescended Testis vs Retractile Testis

Here is a table that outlines the differences between undescended testis and retractile testis:

In summary, an undescended testis is a testis that has not moved into its proper position in the scrotum before birth, while a retractile testis is a descended testis that can move between the scrotum and groin. Undescended testes have an increased risk of testicular cancer, while retractile testes do not lead to cancer or other complications.