Radiation therapy is one of the main treatment options for medulloblastoma, and after radiation therapy, children may develop a variety of long-term complications, one of which is cavernous hemangioma, also known as radiation-induced cavernous hemangiomas (RICH). Since Ciricillo et al. first reported in 1994 that radiation therapy may lead to the formation of cavernous hemangiomas, RICH has been reported by a succession of scholars. The probability of RICH after radiotherapy is currently reported to be 3.4-31%, while the probability of cavernous vascular malformation in the normal population is 0.4-0.9%. with the increased awareness of RICH, the rate of RICH has tended to increase in the last decade. strenger et al. investigated 171 patients who received radiotherapy and showed that 8 patients had The results showed that 8 patients had RICH and 7 of them were younger than 10 years old at the time of radiotherapy; Vinchon et al. followed up 552 patients and diagnosed RICH in 23 cases and found that it was more common in males than females; Burn et al. followed up 297 patients (all younger than 16 years old at the time of radiotherapy) and found that 10 patients had RICH and found that the presence or absence of chemotherapy was not a risk factor for RICH. There are no reports of RICH in China. It is believed that if the age of radiotherapy is less than 10 years and the dose of radiotherapy is more than 30Gy, the possibility of cavernous vascular malformation will increase, and the time of RICH appears after 2 years of radiotherapy. The reason may be that the site with the highest radiation dose is vascular occlusion, so it is not easy to appear cavernous hemangioma, RICH can be single or multiple, mostly in the cerebral hemisphere, less in the cerebellar hemisphere, but also in the spinal cord. Our pediatric neurosurgery department of Tiantan Hospital also reported 2 cases in which both patients were younger than 10 years old at the time of radiotherapy, and the dose of radiotherapy was greater than 30Gy in one case and close to 30Gy in the other, and the site of RICH appeared in the cerebral hemisphere, and both were found more than 2 years ago, which is consistent with the above. Cranial CT scans detect approximately 30-50% of RICH, and T2-weighted gradient-echo imaging MRI (Gradient-echo MRI, GRE-MRI) provides better detection of RICH lesions and is currently the most sensitive method for cavernous vascular malformations. Most RICH are found during clinical follow-up and are mostly asymptomatic, while some patients present with epilepsy, sensory abnormalities, motor disturbances, headache, and vomiting. The treatment options are observation and surgery. Radiotherapy is not currently recommended for the treatment of RICH. The indications for surgical treatment of RICH are: increase in lesion diameter, acute bleeding, and worsening of the patient’s symptoms. The probability of acute bleeding in the normal population is 0.25-3.1% per year for cavernous vascular malformations, and current reports indicate that the probability of bleeding is higher for RICH than for other cavernous vascular malformations. In 2010, Aguilera et al. reported a case of a child with recurrent medulloblastoma with RICH who was treated with Avastin (Bevacizumab, Avastin). No further reports have been seen on whether Avastin can be used in the treatment of RICH. In the current reports on RICH, medulloblastoma is the most common primary disease, and other diseases include acute lymphoblastic leukemia, ventricular meningioma, and glioma. Medulloblastoma is one of the most common diseases in childhood, and its high incidence age is 5-7 years. Whole brain spinal axis radiotherapy is an indispensable treatment in children older than 3 years, and its radiation dose often exceeds 30 Gy. Moreover, the prognosis of medulloblastoma is better, and the 5-year survival rate of medulloblastoma in the low-risk group has now exceeded more than 50%, and factors may be responsible for the occurrence of postoperative medulloblastoma These factors may explain the high rate of RICH after medulloblastoma surgery, and therefore the diagnosis and treatment of RICH need to attract the attention of doctors in related departments.