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HRCT findings for tuberculous otomastoiditis and nontuberculous otomastoiditis
CT findings TOM (n = 19) COM (n = 30) CHOM (n = 30)
Soft tissue location 
    Mastoid antrum 19 (100%) 29 (97%) 26 (87%)
    Middle ear cavity 
        Entire middle ear cavity 18 (95%) 7 (23%)^* 12 (40%)^*
        Epitympanum 19 28 25
        Mesotympanum 18 11 12
        Hypotympanum 19 11 12
Preservation of mastoid air cells without sclerotic change 14 (74%) 4 (13%)^* 3 (10%)^*
Soft tissue extension to the EAC or mucosal thickening of EAC 12 (63%) 0^* 5 (17%)^*
    Erosion of ossicles 6 (32%) 12 (40%) 26 (87%)^*
        Malleus 2 4 26
        Incus 6 11 25
        Stapes 3 5 14
    Erosion of scutum 0 3 (10%) 15 (50%)^*
    Erosion of bony labyrinth 1 0 2
    Erosion of facial nerve canal 0 0 3
    Erosion of tegmen tympani 1 2 2
Note:— TOM indicates tuberculous otomastoiditis; COM, chronic otomastoiditis; CHOM, chronic otomastoiditis with cholesteatoma; EAC, external auditory canal.
* Statistically significant compared with tuberculous otomastoiditis by χ ² test (P < .05).