The borderline between acute rhinitis and sinusitis.
D000208:Acute Disease; D000328:Adult; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus; D011859:Radiography; D012220:Rhinitis / Q000150:complications*; D012852:Sinusitis / Q000000981:diagnostic imaging / Q000209:etiology* / Q000628:therapy; D007507:Therapeutic Irrigation