髓母细胞瘤是一种神经上皮胚胎性恶性肿瘤,主要发生在小脑蚓部,容易突入第四脑室,约占颅内神经上皮肿瘤4%~8%,占颅内肿瘤的1.84%~6.54%,发病年龄多在20岁以内,男女发病比率2~3∶1。但兄妹二人同患此病尚属罕见,现报告如下。1病历摘要女,8月龄。主因呕吐昏迷1 h入院。患儿于入院 Medulloblastoma is a neuroepithelial embryonic malignant tumor, mainly in the cerebellar vermis, easily into the fourth ventricle, accounting for about 4% to 8% of intracranial neuroepithelial tumors, accounting for 1.84% ~ 6.54% of intracranial tumors , Age of onset more than 20 years of age, the incidence of male and female 2 to 3: 1. However, the two brothers and sisters with the disease is still rare, are as follows. 1 medical records female, 8 months old. The main vomiting coma 1 h admission. Children admitted to hospital