Alpha-N-acetylgalactosaminidase (NAGA) deficiency type 1 is a very rare and severe type of NAGA deficiency characterized by infantile neuroaxonal dystrophy. The disease is Monarch Disease Ontology identifier MONDO_0012221 (alpha-N-acetylgalactosaminidase deficiency type 1). Also known as: NAGA deficiency type 1, Schindler disease type 1, Schindler disease, type III.