Thunderclap Headache With Normal CT? Think RCVS ⚡🧠 Sudden thunderclap headache with an initially normal CT scan can be misleading 🚨 This reel shows multimodality imaging of Reversible Cerebral Vasoconstriction Syndrome (RCVS)—from CT and MRI to MRA and DSA. 🔍 Key imaging clues: • Cortical subarachnoid hemorrhage • Watershed infarcts on DWI • Multifocal “string-of-beads” vasoconstriction • Reversibility within 3 months (diagnostic hallmark) 💡 Clinical Pearl: Normal early imaging does not excl