Reversible cerebral vasoconstriction syndrome: a rare entity in children presenting with thunderclap headache.

Reversible cerebral vasoconstriction syndrome is characterized by a reversible segmental and multifocal vasoconstriction of cerebral arteries, and severe headaches with or without focal neurologic deficits or seizures. A 15-year-old boy presented with thunderclap headache. He had severe hypertension, although his neurologic examination was normal. Initial workup for thunderclap headache to exclude subarachnoid or intracranial hemorrhage, meningitis, pituitary apoplexy, or venous sinus thrombosis was negative. Brain magnetic resonance angiography and cerebral angiography demonstrated bilateral anterior and posterior circulation diffuse, multifocal, vascular irregularities (beading and stenosis) suggestive of underlying vasculopathy or vasculitis. He was started on verapamil. There was complete reversal of the vascular abnormalities in 6 weeks evident by magnetic resonance angiography, with resolution of headache and normalization of blood pressure. Reversible cerebral vasoconstriction syndrome has been rarely reported in children. This case report highlights the diagnostic dilemma and management of the rare childhood presentation of this condition.