What is the reason for one testicle being larger than the other in men?

Patient's question:

I don't have any symptoms in my whole body, except that I'm not very tall, only 1.5 meters. My genitalia are small, and my testicles are one larger than the other.
The time and cause of the condition were checked when I was 5 years old, and the doctor said it was normal. At that time, the examination was done by visual observation and manual palpation. I've been to several hospitals, and they've all said the same thing.
Only last year did I have an ultrasound, which revealed that my testicles are one larger than the other, and my penis has excessive foreskin. I had surgery and took the medication prescribed by the doctor. After a year has passed, there's still no change. My genitalia are still the same size as before.

Doctor's answer:

The individual variation in testicular volume among normal adult males is significant, and the testicles on both sides are not identical. Statistics show that the right testicle is slightly larger than the left, with an average size of 3.38×2.27×1.71 cm on the right and 3.30×2.37×1.78 cm on the left. Even among individuals of the same age group, there are differences in testicular size. In normal adult males, the volume of the testicles can range from as large as 25 mL to as small as several milliliters. It is generally considered that testicular volume smaller than 10 mL in adults is classified as microorchidism. In normal individuals, the testicles may be of unequal size, but the difference is usually not substantial. If both testicles fall within the normal size range, it will not affect fertility. However, if the difference is significant, it generally indicates the presence of certain urogenital system diseases, requiring prompt medical examination and diagnosis.

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