Delusions are common in neurodegenerative disorders too; in the largest series of 97 neuropathologically confirmed cases of FTD, 32% had psychotic symptoms, 20.6% had paranoid ideas, 17.5% hallucinated and 17.5% had delusions, with psychotic symptoms present in all pathological subtypes (tau, TDP, FUS).29 Delusions were most commonly paranoid or persecutory, followed by erotomania.29,30. The gene discussed is MAPT; the disease is frontotemporal dementia.