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 triad of symptoms including discrete atrophic choroidal scars in the macula or midperiphery known as histo spots, peripapillary atrophy, and choroidal neovascularization. The presumed association with histoplasmosis is mostly due to overlapping epidemiology.