Caplan syndrome https://www.malacards.org/card/caplans_syndrome EFO:0007192 MEDGEN:743 GARD:0024218 MESH:D002205 UMLS:C0006915 SCTID:398640008 A combination of rheumatoid arthritis (RA) and pneumoconiosis that manifests as intrapulmonary nodules, which appear homogenous and well-defined on chest X-ray. DOID:10326 MONDO:0005690 pneumoconiosis obsolete_Caplan's syndrome