Transient modifications of the olfactory bulb on MR follow-up of COVID-19 patients with related olfactory dysfunction.

Background: Olfactory dysfunction (OD) has been reported with a high prevalence on mild to moderate COVID-19 patients. Previous reports suggest that volume and signal intensity of olfactory bulbs (OB) have been reported as abnormal on acute phase of COVID-19 anosmia, but a prospective MRI and clinical follow-up study of COVID-19 patients presenting with OD was missing, aiming at understanding the modification of OB during patients'follow-up.

Methods: A prospective multicenter study was conducted including 11 COVID-19 patients with OD.