MRCP2-3093

A 25-year-old female patient presents with a medical history of recurring episodes of dysarthria, ataxia, and diplopia lasting for 20-30 minutes, followed by a severe headache on the right side accompanied by vomiting that lasts for one to three days. These episodes occur once every month. The patient’s MRI brain and MR angiogram results are normal. What is the probable diagnosis?