| RCVS | reversible cerebral vasoconstriction syndromes |
| TCD | transcranial doppler |
| IUS | intrauterine system |
| CTA | computed tomography angiography |
| VA | vertebra artery |
| MFV | mean flow velocities |
| MRA | magnetic resonance angiography |
| ACA | anterior cerebral arteries |
| MCA | middle cerebral arteries |
| NO | nitric oxide |
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