Cases of frontotemporal lobar degeneration‐TDP43 (FTLD‐TDP), manifested as sporadic (sFTLD‐TDP) or linked to mutations in various genes including expansions of the non‐coding region of C9ORF72 (c9FTLD), and of sporadic amyotrophic lateral sclerosis (sALS) as the most common TDP43 proteinopathies, were analysed. Here, C9orf72 is linked to sporadic amyotrophic lateral sclerosis.