Why is a child's testicles so big on one side and so small on the other?

Congenital testicular dysplasia is mostly caused by genetic factors - chromosomal abnormalities. One of our common symptoms of chromosomal abnormalities is Klinefelter's syndrome, which has a high incidence rate. There is also a type of Kaman syndrome, which is caused by abnormal low gonadotropin, causing abnormal development of the testicles.

Acquired testicular dysplasia means that the patient's own chromosomes are in a normal state, but due to the influence of various pathogenic factors during the fetus, childhood or early childhood, the testicles develop abnormal development. If some children get mumps, if the mumps affects the testicles, it may cause viral orchitis, which may lead to abnormal testicular development.

The testicles normally develop within the fetal abdomen and gradually descend into the scrotum during the last 3 months. When the testicles cannot move normally into the scrotum, it is called testicular insufficiency, also known as cryptorchidism. It is a common pediatric surgical disease. About 30% of premature infants will develop incomplete testicular descent, and 3% of full-term infants will have this phenomenon. It is more common on one side, with the right side more common than the left side. Some testicles that are not descended at birth can descend to the scrotum on their own within a few months. In about 1/150 babies, the testicles never descend to the scrotum.

Some baby boys have testicles that are one large and one small, or both sides are larger than the testicles of normal baby boys, and they feel harder to the touch. If they are illuminated with a flashlight, they will be translucent. This is commonly known as watery eggs, and medically it is called testicular hydrocele. If the fluid accumulates around the testicles and is blocked from the abdominal cavity, it is called non-communicating testicular hydrocele. ； If the fluid is connected to the abdominal cavity, that is, it increases when the baby is held upright and decreases when the baby is lying down, it is communicating testicular hydrocele. ； If there is a separate cyst above the testicle, it is a spermatic hydrocele.