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Table 1 Critical elements for the diagnosis of RCVS.

From: Intra-arterial application of nimodipine in reversible cerebral vasoconstriction syndrome: a neuroradiological method to help differentiate from primary central nervous system vasculitis

Clinical features
Severe, acute ‘thunderclap’ headaches, with or without additional neurological signs due to (watershed) strokes, subarachnoidal haemorrhages
Associated conditions (e.g. medication, drugs, and blood products)
Radiological features
Conventional angiography or indirect CTA or MRA with ‘vasculitis-like’ multi-focal segmental cerebral artery vasoconstriction
Watershed (strokes)
Subarachnoidal haemorrhages (cortical)
No evidence for aneurysmal subarachnoid haemorrhage
Reversibility of angiographic abnormalities within 12 weeks after onset
Others
Normal or near-normal cerebrospinal fluid analysis (protein level < 80 mg%, leucocytes < 10 mm3, normal glucose level)
  1. CTA, computed tomographic angiography; MRA, magnetic resonance angiography