Patient: Description of condition (onset, main symptoms, hospital visited, etc.): Patient female, 39 years old. diagnosed as cavernous hemangioma with hemorrhage in the neurosurgery department of Xijing Hospital after convulsions on January 5, 2011, now with severe cerebral edema, headache and vomiting, and weakness and shaking of the left limb when severe. In January 2011, he was treated in the neurosurgery department of Xijing Hospital, and on March 15, 2011, he was treated with Gamma Knife in Xijing Hospital. 1.How long does the cerebral edema last after gamma knife treatment? 2.Can you give some treatment suggestions? 3.How can I make the edema not recur? Beijing Tiantan Hospital, Department of Neurosurgery: It has been so long and still edema? Could it be radiation reaction? Please take photos and upload the examination films so that we can understand the condition and give treatment suggestions. Patient: Hello, Dr. Yuan! What is radiation reaction? I have uploaded the film. How can I treat radiation reactions? I hope to get your answer as soon as possible. Thank you! Beijing Tiantan Hospital Neurosurgery Department: I have not seen the film. Radiation reaction is the reaction after gamma knife radiotherapy, general dehydration treatment, if necessary, use some hormones. Patient: new information uploaded Beijing Tiantan Hospital Neurosurgery Department: How can there be intracranial pneumonia after gamma knife treatment? Make sure there is no drill fracture or something? It is recommended to review the enhanced head CT or MRI examination.