Why should a liver cancer patient to hallucinate?

liver fails ; other: Hepatic encephalopathy this is graded from 0 to 4: grade 0 (subclinical) - normal mental status, but minimal changes in memory, concentration, intellectual function, co-ordination. Grade 1 - mild confusion, euphoria or depression, decreased attention, slowing of ability to perform mental tasks, irritability, disorder of sleep pattern, such as inverted sleep cycle. Grade 2 - drowsiness, lethargy, g.