Due to the anatomical characteristics of the posterior cranial fossa, the incidence of hematoma in the posterior cranial fossa is very low, generally accounting for only about 5% of all intracranial hematomas. Any type of hematoma may occur, with epidural hematoma being the most common, followed by subdural hematoma and intracerebral hematoma. Epidural hematoma of the posterior cranial fossa Epidural hematoma of the posterior cranial fossa is usually accompanied by occipital fracture, which causes bleeding due to injury to venous sinus or meningeal vessels. The rupture of the venous barrier at the fracture site is also one of the causes of hemorrhage. There are also cases where the hematoma in the occipital part of the curtain spreads downward to form a curtain riding up and down to the swelling. Clinically, the time of appearance of symptoms varies, 40% of patients have symptoms within 24h; more than 50% of patients have symptoms within 6d, and only very few patients have symptoms after 1 week. Symptoms of epidural hematoma in the posterior cranial fossa include headache and neck stiffness, which may be accompanied by cranial injury. Cerebellar ataxia is present in less than 50% of patients, with progressive deterioration of consciousness, positive bilateral pyramidal signs, and changes in vital signs that can occur with brainstem compression in the late stages of the injury.CT is a rapid and accurate diagnostic tool for the diagnosis of posterior cranial fossa epidural hematomas. Scanning of the posterior cranial fossa should be performed in patients with craniocerebral trauma, especially in patients with severe post-injury headache, frequent vomiting and lack of focal localization signs. The principle of treatment is surgical removal of the hematoma. The prognosis is closely related to the degree of preoperative impaired consciousness of the patient, and the mortality rate before the application of CT can reach 37%~69%, timely detection of hematoma by CT and early surgical removal of hematoma is the guarantee of successful treatment. 2.Subdural hematoma of posterior cranial fossa The incidence of subdural hematoma of posterior cranial fossa accounts for less than 1% of all subdural hematomas, and the hemorrhage mainly comes from the tearing of the bridging vein on the surface of cerebellum. venous sinus hemorrhage or from contusion of the cerebellar cortex. Impaired consciousness, severe headache and frequent vomiting are common symptoms. Cranial nerve injury, cervical tonus and cerebellar symptoms are seen in 50% of patients, and clinical symptoms may appear immediately or 24 h after injury. Diagnosis and treatment are similar to that of posterior cranial fossa epidural hematoma.