Any Ullrich congenital muscular dystrophy in which the cause of the disease is a mutation in the COL12A1 gene. The disease is Ullrich congenital muscular dystrophy 2 (Monarch Disease Ontology entry MONDO_0014654). Also known as: COL12A1 Ullrich congenital muscular dystrophy, Ullrich congenital muscular dystrophy caused by mutation in COL12A1, Ullrich congenital muscular dystrophy type 2.