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 sarcoidosis that is characterized by involvement of the nervous symptom with cranial nerve palsy, diffuse meningeal disease, acute polyneuropathy, myelitis, or hypothalamic pituitary axis malformation, develops_from a type IV hypersensitivity reaction with noncaseating granulomas involving the nervous system. (DO)