A 45 years old presents with sudden onset severe headache, unlike anything she had ever experienced. She vomited many times before seeking medical attention. On presentation she requires stimulation to maintain alertness and has mild nuchal rigidity. Examination reveals hypertension and slight ptosis and dilation of the left eye with minimal reaction to light. What are the most important differential diagnoses?

Of the relevant differential diagnoses, it is important to rule out subarachnoid hemorrhage.

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This post was written by Omar Rifai