Patient: Description of condition (onset, main symptoms, hospital visited, etc.): , 42 years old, in March ’09, he was unable to eat due to vomiting, which lasted for more than a month, and developed unsteadiness in walking, which later resolved on its own, but no brain examination was done at that time. In early June of this year, he began to experience decreased temperature sensation on one side of his face, and ten days later, he developed monocular diplopia, vertigo, occasional difficulty in swallowing, unsteadiness in walking, snoring in sleep, and slight loss of limbs on one side. in July, MRI results of medullary cavernous hemangioma were obtained, and MRI+ examination was done at the end of August at Tiantan Hospital. Since July, the symptoms have been relieved continuously, and most of them have disappeared, but I can still feel a little pain in the lesion area. 1. From the current location of the lesion, is it very risky to operate at this location, and if operated, what are the more likely symptoms after the operation? What are the possible sequelae in the long term? 2. What is the risk of conservative observation? Is the risk of conservative observation greater or the risk of surgery greater? Thank you for your reply! Liu Zhengyin, Department of Neurosurgery, Shanghai Huashan Hospital: The diagnosis is relatively clear. The previous symptoms were caused by bleeding from the lesion, and gradually improved due to the absorption of the bleeding. But this lesion still has the possibility of bleeding again and the symptoms will be worse. I think we should operate, although the risk is higher!