<prompt> Differential diagnosis for thunderclap headache are all except:EncephalitisIschemic strokeSubarachnoid hemorrhageMeningitis  <response>: Thunderclap Headache - Thunderclap headache is a severe headache that peaks within 60 seconds of onset, and its cause are: Subarachnoid hemorrhage: BERRY ANEURYSM Intracranial hypotension: DURAL ECTASIA CSF Leak syndrome Reversible cerebral vasoconstriction syndrome Cervical aery dissection, Cerebral venous thrombosis Migraine Cluster headache Pituitary apoplexy 