Demographics:
69 years old, Male
Indication:
Acute headache
Findings
- Acute subarachnoid hemorrhage predominately in the interpeduncular and ambient cisterns extending into the prepontine cistern
- No supratentorial blood products
- CTA and DSA are normal without evidence of aneurysm
Diagnosis
Perimesencephalic non-aneurysmal subarachnoid hemorrhage
Sample Report
CT: Acute subarachnoid hemorrhage predominately in the interpeduncular and ambient cisterns extending into the prepontine cistern. No supratentorial blood products. No substantial mass effect or hydrocephalus.
CTA: No aneurysm identified; however consider catheter angiography for a more sensitive evaluation.
Discussion