| PMSAH | Perimesencephalic subarachnoid hemorrhage. |
| PMH | Perimesencephalic hemorrhage. |
| aSAH | aneurysmal subarachnoid hemorrhage. |
| NAPMSAH | Non-aneurysmal perimesencephalic suabrrachnoid hemorrhage. |
| CT | Computer tomography. |
| DSA | digital subtraction angiography (addressing point 25). |
| MR | Magnetic resonance. |
| CSF | Cerebrospinal fluid |
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