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Comparison of olfactory function between neuromyelitis optica and multiple sclerosis |
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| Authors: | Li-Min Li Hui-Yue Guo Ning Zhao Lin-Jie Zhang Ningnannan Zhang Jingchun Liu |
| Institution: | 1. Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, Tianjin, China;2. Department of Neurology, Anyang District Hospital of Puyang City, Henan Province, China;3. Tianjin Key Laboratory of Functional Imaging, Department of Radiology, Tianjin Medical University General Hospital, Tianjin, China |
| Abstract: | Objectives: Olfactory dysfunction (ODF) has been reported in patients with neuromyelitis optica (NMO) and multiple sclerosis (MS). However, the comparison of olfactory function and olfactory-related gray matter (GM) between patients with NMO and MS needed to be further elucidated. Materials and methods: Thirty-seven patients with NMO and 37 with MS were enrolled. Olfactory function was evaluated with a Japanese T&T olfactometer test kit, and the neuroanatomical features of olfactory-related GM were assessed using voxel-based morphometry. Results: Olfactory deficits were found in 51.4% of patients with NMO and 40.5% of patients with MS. Patients with NMO with ODF had significantly smaller olfactory bulbs than patients with MS with ODF (p = 0.031). Olfactory-related GM atrophy was found in patients with NMO in several regions of the right orbitofrontal cortex and right superior frontal gyrus; in patients with MS, reduced GM volume was found in the right parahippocampal gyrus and piriform cortex (p < 0.05, cluster size > 200 voxels). Conclusions: Olfactory deficits are common in both NMO and MS. However, the neuroanatomical features related to olfactory deficits differ greatly between the two diseases. |
| Keywords: | Neuromyelitis optica multiple sclerosis olfaction olfactory bulb gray matter voxel-based morphometry |