Atrophy and neuropathy of the olfactory bulb on MR images according to the Korean Version of the Sniffin' Sticks II test results and etiologya
| Etiology | Normosmia | Hyposmia/Anosmia | P Valueb |
|---|---|---|---|
| Chronic rhinosinusitis (n = 15) | |||
| Atrophy | 0/4 (0) | 7/11 (63.6) | .077 |
| Neuropathy | 1/4 (25.5) | 3/11 (27.3) | 1.000 |
| Postviral URI (n = 7) | |||
| Atrophy | 1/3 (33.3) | 3/4 (75.0) | .486 |
| Neuropathy | 2/3 (66.7) | 1/4 (25.0) | .486 |
| Trauma (n = 2) | |||
| Atrophy | 0/0 (0) | 1/2 (50.0) | NA |
| Neuropathy | 0/0 (0) | 0/2 (0) | NA |
| Idiopathic (n = 10) | |||
| Atrophy | 0/3 (0) | 6/7 (85.7) | .033 |
| Neuropathy | 1/3 (33.3) | 1/7 (14.3) | 1.000 |