## **Core Concept**
Ectopic testis refers to a condition where a testicle is located outside its normal path of descent, often found in abnormal locations such as the superficial inguinal pouch, perineum, or even inside the abdominal cavity. Complications arise due to abnormal positioning and potential risks include impaired fertility, increased risk of testicular torsion, and malignancy.

## **Why the Correct Answer is Right**
The correct answer, **C. Testicular cancer**, is a recognized complication associated with ectopic testis. This is because undescended or ectopically located testes have a higher risk of developing into testicular cancer compared to normally descended testes. The exact mechanism is not fully understood, but it's thought to be related to the abnormal environment and temperature regulation affecting testicular development.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While issues like infertility and subfertility can be concerns for individuals with a history of undescended or ectopic testes, they are not typically listed as direct complications in the same immediate context as cancer or torsion.
- **Option B:** Inguinal hernia is indeed associated with undescended testes (cryptorchidism) due to the patent processus vaginalis, but it's not a complication of the ectopic testis itself; rather, it's a related condition.
- **Option D:** While testicular torsion can occur in any testis, it's not specifically a complication unique to ectopic testis; it's a risk for any undescended or normally descended testis.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that individuals with a history of undescended or ectopic testes are advised to perform regular testicular self-examinations and may require closer surveillance for testicular cancer. Orchidopexy (surgical placement of the testis into the scrotum) can help mitigate some risks but does not entirely eliminate the risk of cancer.

## **Correct Answer: C. Testicular cancer**