Well-defined hypoattenuation involving the most inferior aspect of the left cerebellar hemisphere is in keeping with the left PICA vascular territory infarct. There is no significant mass effect over the brainstem and fourth ventricle. No haemorrhage transformation. Supratentorial ventricles and basal cisterns are unremarkable. White matter hypoattenuation areas are nonspecific, most likely representing chronic small vessel ischaemia, in a number distribution over the expected for the patient's age group. No evidence of new infarcts. The lacunes seen on the MRI are not well appreciated on CT.