MG is classified according to autoantibody status, most commonly into anti-acetylcholine receptor (AChR) (85%), anti-muscle-specific kinase (MuSK) (6%), and anti-low-density lipoprotein receptor-related protein 4 (LRP4) (2%) subtypes, as well as seronegative MG [15]. Here, LRP4 is linked to myasthenia gravis.