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Non-contrast CT demonstrates minimal subarachnoid haemorrhage in the prepontine and interpeduncular cisterns. Mild/moderate hydrocephalus.
On CTA, the right superior cerebellar artery shows small saccular aneurysm at its origin. It measures 2mm in max transverse diameter. It has a narrow neck and its fundus is projecting laterally. No evidence of contrast extravasation.The distal portion of the artery isn't visualised (likely spastic).
Compare with the normal contralateral left superior cerebellar artery.
Hypoplastic right P1 segment with continuation of the right PCOM artery (normal variant).