EntityQ560601· pop 5HDNSign in to saveHDN may refer toArticle3 sectionsContentsMedicinePlacesOtherHDN may refer to==Medicine== Hemolytic disease of the newborn, an alloimmune illness Hydronephrosis, hydrostatic dilation of the kidneyRead full article (4 paragraphs)ConnectionshydronephrosisEntityHaidaEntityfetal erythroblastosisEntityHarlesden stationEntityAelius HerodianusEntityHyperdimension NeptuniaEntityYampa Valley AirportEntity