“…, 18 , 20 – 22 , 24 , 29 , 34 , 39 , 41 Nasal symptoms on which diagnoses were based were detailed in 13 studies (40.63 per cent) 13 19 , 24 , 25 , 28 – 30 , 35 , 36 , 39 , 42 – 44 Eight studies (25 per cent) reported on poor response to pre-operative treatment: intranasal corticosteroids or oral antihistamines (six studies), 9 , 10 , 12 , 13 , 23 , 25 immunotherapy (one study), 23 and septoplasty or inferior turbinate surgery (one study) 43 . A good response to anticholinergic nasal spray was reported in one study, and served as an indication for surgery (vidian neurectomy) 4 .…”