We report a 58-year-old woman with a novel splice-site variant in the TANK-binding kinase 1 (TBK1:c.993-2A>C p.Ala332TyrfsTer39) who sequentially developed primary lateral sclerosis (PLS) followed by right temporal variant frontotemporal dementia (rtvFTD). The gene discussed is TBK1; the disease is Primary lateral sclerosis.