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Reversible Cerebral Vasoconstriction Syndrome (RCVS) is a syndrome mimicking diverse clinical and radiological conditions. Pathologically there is altered cerebral vascular tone without histological evidence of active inflammation or vasculitis. Most common clinical presentation is hyper acute thunderclap headache with or without neurological deficit. It poses a great diagnostic dilemma; however knowledge of symptoms and radiological manifestations can help in accurate diagnosis and treatment.