High-resolution computed tomography in the diagnosis of otosclerosis in Taiwan.
BACKGROUND
Otosclerosis is rare in Asians, and the clinical role of imaging remains controversial. We sought to clarify the tomographic findings of otosclerosis in Taiwanese patients and determine the value and necessity of high-resolution computed tomography (HRCT) of the temporal bone in diagnosing the disease in Taiwan.


METHODS
This retrospective study enrolled 22 patients (24 ears) with clinically, surgically and pathologically confirmed otosclerosis. All subjects underwent HRCT of the temporal bone; the images were then reviewed at workstations. The control group consisted of 15 patients.


RESULTS
HRCT was positive in 46% of the clinically, surgically and pathologically confirmed otosclerotic ears. Patients with a positive imaging study had a smaller preoperative air-bone gap and a significantly shorter duration of the disease. The duration of the disease also tended to be greater in patients with a larger preoperative air-bone gap.


CONCLUSIONS
HRCT has high specificity (100%) but low sensitivity (46%) for the diagnosis of otosclerosis in Taiwanese patients despite progress in radiology. The low image positive rate we found, compared with that in Western literature, may stem from a greater percentage of inactive otosclerosis.
Lee
Tsung-Lun
TL
Department of Otolaryngology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.
Wang
Mao-Che
MC
Lirng
Jiing-Feng
JF
Liao
Wen-Huei
WH
Yu
Eric Chen-Hua
EC
Shiao
An-Suey
AS
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010040:Otosclerosis / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*