Dogan A, et al. - In patients with migraine, the measurements of olfactory bulb (OB) volume and olfactory sulcus (OS) depth were compared with a control group. Findings revealed lower OB volume and OS depth values in migraine patients. Compared to the non-osmophobia migraine patients, lower OB volume was noted in patients with osmophobia. A recommendation of olfactory function monitoring and olfactory volume monitoring on MRI was made for all migraine patients to diagnose olfactory dysfunction earlier, especially those with osmophobia. Compared to the migraine patients without osmophobia, they presented with lower OB volume values, therefore blood flow changes and osmophobia could affect the olfactory bulb volume shrinkage in migraine patients.