Whether the right cerebellar patchy low-density shadow is serious depends on whether the patient has symptoms or not. If it is accompanied by symptoms such as numbness of the limbs, then it is more serious and should be treated in time; if there are no symptoms, then it can be reviewed and observed on time. When patients have patchy low-density shadows in the right cerebellum, accompanied by symptoms such as inflexible limb movement and numbness, it means that the patient is in the acute stage of cerebrovascular disease, which is more serious and needs timely treatment because once the patient’s condition aggravates, it may lead to limb paralysis, unfavorable language or complete aphasia and other symptoms. If the patient has patchy low-density shadow in the right cerebellum without symptoms, it is considered to be the manifestation of old lacunar cerebral infarction or the recovery period after cerebral hemorrhage, and it is recommended that the patient undergoes review on a regular basis to observe the changes. When the patient’s right cerebellum appears patchy low-density shadow, further examination should be carried out to clarify the cause of the disease, and timely treatment under the guidance of the doctor.