CT - Uncontrasted CT head (with stroke window)
Axial non-contrast
Axial Stroke window
There is wedge-shaped hypodensity involving the PCA territories bilaterally, worse on the left with loss of grey-white matter differentiation in keeping with ischaemic infarct. The infarct also involves the left cerebral peduncle/ midbrain and both cerebellar hemispheres.
Allowing for the extensive streak artefacts in the posterior fossa, there is a well-defined hyperdensity in the basilar artery concerning for a hyperdense basilar artery thrombus. Another hyperdense clot is noted along the P1 segment of the left PCA.
Otherwise, no intracranial bleeding or extradural collection. No significant oedema or mass effect. No midline shift or hydrocephalus.
A decision was made to perform an intracranial angiogram.