C9orf72 and amyotrophic lateral sclerosis: Delusions (but not hallucinations) are also more common in FTD-ALS than in bvFTD without ALS13 As such, it was interesting that in this case (c9orf72 positive FTD-ALS) the patient had visual hallucinations, as these are relatively rare in FTLD14 and in cases of psychosis amongst C9orf72 carriers.15