The pre-surgical examination items for cryptorchid penis include physical examination, penile vascular ultrasound, penile cavernography and so on. 1. Physical examination: During the physical examination, the doctor will press the prepubic fat with his hand to make the body of the penis exposed as much as possible, check the length and thickness of the penis, and determine whether it is an invisible penis. 2. Ultrasound of penile blood vessels: Generally, there is no need for special examination for hidden penis, but if you want to have hidden penis surgery, you need to have ultrasound of penile blood vessels to judge the patient’s erectile function. 3. Penile cavernography: X-ray shows that the penile pedicle and the sub-sciatic branch are separated, and the penile venous system is examined. Penile venous leakage type, penile pedicle leakage type, cavernous septal leakage type, ectopic venous leakage type, cavernous type, and mixed penile venous leakage type are more common. There are many pre-surgical tests for cryptorchid penis, which need to be performed according to the physician’s instructions to avoid delays.