목적: Acute vestibular neuritis (AVN) mostly involves the superior portion of the vestibular nerve and labyrinth. Inferior vestibular neuritis (IVN) is a relatively minor subtype of vestibular neuritis. This study aimed to investigate the clinical course and characteristics of AVN according to its involvement sites. 방법:We retrospectively reviewed 133 patients with AVN between January 2012 and January 2015, which were diagnosed on the basis of symptoms and laboratory findings including caloric test, cervical vestibular evoked myogenic potential (cVEMP), video head impulse test (vHIT). All patients were classified into three groups (1) TVN group who showed unilateral canal paresis in caloric test and ipsilesional cVEMP weakness (2) SVN group who showed unilateral caloric canal paresis only (3) IVN group who showed unilateral cVEMP weakness only. We analyzed the clinical course and characteristics between the three groups. Also, we studied the correlation of vHIT results with caloric test and cVEMP in AVN patients. 결과:Of the 133 patients with AVN, TVN group was 53 (39.9%) and SVN group was 64 (48.1%) cases. 16 (12.0%) patients were classified as IVN. But, down beating spontaneous nystagmus (SN) were observed only 3 (18.7%) in IVN group. The days to remission of SN in IVN (10.2±7.9) group was significantly shorter than with TVN and SVN (21.0±33.3, p=0.042 and 21.5±26.8, p=0.007, respectively) group. Duration of hospitalization and follow up period of IVN group (3.6±1.6, 31.3±40.6 days, respectively) were shorter than those of SVN (4.6±1.5days, p=0.029 and 63.7±83.6 days 0.035, respectively) and TVN group (4.6±1.6days, p=0.045 and 59.0±79.9, p=0.078 days, respectively). The CP value between TVN and SVN group (76.5±28.5, 81.7±25.5, respectively) had no statistical difference. The amplitudes of SN in IVN group (5.1±3.8) were smaller than TVN and SVN group. (8.3±5.2 p=0.012, and 10.1±6.5, p<0.001 respectively) In the vHIT analysis of 74 patients, 38 (97.4%) of 39 patients showed positive horizontal vHIT and 36 (92.3%) of 39 patients showed positive anterior vHIT in SVN group. 3 (50%) of 6 patients in IVN group showed positive posterior vHIT. In TVN group, 27 (93.1%) of 29 patients showed positive horizontal vHIT and 25 of 29 (86.2%) revealed positive anterior vHIT. 29 (100%) of 29 patients were presented with positive posterior vHIT. 결론:Inferior vestibular neuritis (IVN) was minor subtype of vestibular neuritis and its clinical characteristics were different from those of SVN and TVN. Disease course of IVN was relatively mild and short to compare with TVN and SVN. Also, various involvement sites of labyrinth could be possible and it might have a role of discrepancy between each diagnostic test in acute vestibular neuritis.