Medulloblastoma is a malignant tumor that occurs in the posterior cranial fossa of children, and its early symptoms should be paid attention to. The late symptoms mainly include the following: 1. Intracranial pressure increase symptoms, mainly due to the tumor growth compressing the four ventricles causing cerebrospinal fluid circulation disorder, causing hydrocephalus and intracranial pressure increase; manifested as headache, vomiting and optic papilledema; 2. Cerebellar damage signs, the tumor compressing the cerebellar primitive part, appearing cerebellar damage signs, mainly manifested as unstable walking, staggering gait, patient standing unstable, unable to walk along the Medulloblastoma can spread with cerebrospinal fluid circulation. If the tumor is planted in the brain or spinal cord, corresponding localization signs will appear; 4. Other rare symptoms, such as facial palsy, choking and coughing, diplopia, the most serious is cerebellar crisis, the tumor will eventually compress the brain stem and cause obstructive hydrocephalus; the patient’s respiratory slowdown, or even respiratory arrest, impaired consciousness, and deactivation of the brain are quite dangerous.