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A 42 year old man presents with weakness and parasthesiae of the right arm and leg that developed 12 hours after the onset of a piercing left sided headache. There is no neck stiffness, but there is a pain in the left side of the neck and occiput. Kernig´s sign is negative. He is afebrile, and blood results are normal. The investigation of choice is which one of the following?

A 33 year old woman has a severe frontal and occipital headache as soon as she wakes in the morning. She gave birth to a baby boy one month ago and has not been feeling well since. Exam shows bilateral blurring of the optic discs with pupil sparing and 3rd nerve palsy on the right. The likely diagnosis is