"The visual hallucinations are sterotyped, vivid and tend to not cause the patient significant distress. Additional symptoms include difficulty sleep at night with resultant hypersomnia during the day. Oculomotor abnormalities are also encountered 1."
"Causative lesions are typically in the rostral brainstem (especially cerebral peduncle as the name suggests) but may also be seen in the thalamus, pons and basal diencephalon 1. Essentially any lesion in this area can be causative, including ischaemic (most common), haemorrhagic lesions, vascular malformations and tumours 1,2."