DPM3-CDG is an extremely rare form of CDG syndrome characterized clinically in the single reported case by muscle weakness, waddling gait and dilated cardiomyopathy. The disease is DPM3-congenital disorder of glycosylation (MONDO_0013049). Also known as: CDG syndrome type Io, CDG-Io, CDG1O, DPM3-CDG, carbohydrate deficient glycoprotein syndrome type Io, congenital disorder of glycosylation type 1o, congenital disorder of glycosylation type Io, muscular dystrophy-dystroglycanopathy (limb-girdle), type C, 15.