Symptoms that may occur if cryptorchidism becomes malignant: 1) pain in the scrotum or groin area, which is mild at first but may increase with further deterioration of the nature of the lesion; 2) increase in the volume of cryptorchidism, which may be manifested as local swelling, accompanied by obvious painful sensation of falling, and the volume of the testicle on the side of cryptorchidism is significantly larger than that on the normal side; 3) change in the texture of the testicle. Generally, if cryptorchidism is combined with testicular cancer, the texture of the testicles may become hard and feel similar to touching a stone, while the testicles on the normal side are relatively soft to touch and do not have the painful feeling when touched; 4, Scrotal enlargement. After cryptorchidism becomes malignant, it can be combined with syringomyelia, and then the scrotal volume can increase.