Any inclusion body myopathy with Paget disease of bone and frontotemporal dementia in which the cause of the disease is a mutation in the HNRNPA1 gene. The disease is Monarch Disease Ontology identifier MONDO_0014179 (inclusion body myopathy with early-onset Paget disease with or without frontotemporal dementia 3). Also known as: HNRNPA1 inclusion body myopathy with Paget disease of bone and frontotemporal dementia, inclusion body myopathy with Paget disease of bone and frontotemporal dementia caused by mutation in HNRNPA1, inclusion body myopathy with early-onset Paget disease with or without frontotemporal dementia type 3, inclusion body myopathy with early-onset paget disease without frontotemporal dementia 3.