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 lung disease that is defined as a recurrent or chronic collapse of the right middle lobe, right upper lobe or lingula of the lung. It is caused by endobronchial tumour, granulomatous infections, lymphadenopathy, foreign bodies, endobronchial silicotic nodules, inspissated mucus associated with cystic fibrosis or inflammation as a result of an infection. (DO)