Chronic sinusitis in children.
D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D006801:Humans; D008443:Maxillary Sinus / Q000473:pathology / Q000601:surgery; D009092:Mucous Membrane / Q000473:pathology; D012852:Sinusitis / Q000473:pathology* / Q000601:surgery