Objective To study the CT anatomical features and the clinical significance of temporal bone in unilateral chronic otitis media(COM). Methods The CT images of 35 patients with unilateral COM on the affected side (an experimental group) and the healthy side (a control group) of temporal bone were analyzed retrospectively. Auditory tube angle（ATA）, petroclival angle（PCA）, diameter of aditus mastoid（DA）, diameter（D）and length（L）of osseous segments of Eustachian Tube, the ratio of maximum diameter and length(D/L) of osseous segments of Eustachian Tube and mastoid pneumatization of the two groups were compared. Results In the experimental group, the ATA and the PCA of were (137.4±8.1)°, (52.5±3.8)°, respectively, DA and D were (0.29±0.08) cm, (0.18±0.07) cm, respectively, L was (1.07±0.15) cm and D/L was (17.1±5.4) %. In the control group, the ATA and the PCA of were (138.3±7.7)°, (53.1±4.3)°, respectively, DA and D were (0.35±0.07) cm, (0.21±0.07) cm, respectively, L was (1.17±0.17) cm and D/L was (20.9±14.3) %. There was significant difference in the result of DA, D and L of osseous segments of Eustachian Tube and mastoid pneumatization between experimental group and control group (t/χ2=4.37, 3.09, －3.17, 6.34, P<0.05). There was no significant difference in the result of ATA, PCA, D/L between experimental group and control group (P>0.05). Conclusions There is anatomic variation in the temporal bone of patients with unilateral chronic suppurative otitis media. The small osseous segments of Eustachian Tube, narrow entrance of aditus mastoid and poor mastoid pneumatization are associated with unilateral COM.
Key words
Chronic otitis media /
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CT /
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Temporal bone /
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Anatomy
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