TOR1A and Dystonia: However, a recent study including 9 patients with DYT-TOR1A dystonia, 8 with DYT-THAP1 dystonia, and 38 with unknown forms of isolated dystonia, with a post-operative follow-up between 22 and 92 months, showed similar long-term improvement of BFM-M in DYT-TOR1A and DYT-THAP1 mutation carriers (−44% and −42% respectively) [18].