RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A congenital inner ear malformation that features hearing loss and a cochlea that contains a normal basal turn and cystic apex, a minimally dilated vestibule, and an enlarged vestibular aqueduct. This term has also been used to describe multiple variants of cochlear hypoplasia.