Confined echogenic zone in the spermatic cord behind the left testicle may be caused by syringomyelia, inflammation, varicocele and so on. 1. Syringomyelia: when the lymphatic system of syringomyelia is not well developed or when it is traumatized, it can lead to the gathering of fluid in the syringomyelia and cause syringomyelia, which makes the patient have a limited echogenic zone in the spermatic cord behind the left testis. 2. Inflammation: Inflammation can be caused by bacterial infection in the spermatic cord, which will lead to enlargement of the area and also cause the above findings. 3. Varicocele: Varicocele may be induced by renal cysts and poor working habits for a long time. This disease may lead to swelling of the left side of the scrotum, and when the corresponding examination is done, it can be found that the spermatic cord behind the left testicle is limited to anechoic areas. Confined echogenic zone in the spermatic cord behind the left testicle may also be caused by other reasons, such as cyst, inguinal hernia, etc., which should go to the hospital in time to clarify the cause of the disease and choose the appropriate method of treatment.