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KMID : 0361020000430050476
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Korean Journal of Otolaryngology - Head and Neck Surgery
2000 Volume.43 No. 5 p.476 ~ p.481
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Preoperative Evaluation of Bone Destruction Using Three-dimensional Computed Tomography in the Temporal Bone with Cholesteatoma
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Jang Chul-Ho
Lee Jin-Su
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Abstract
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Background and Objectives : Conventional two dimensional computed tomography
(2DCT) may provide precise details of soft tissues and bony structures of the temporal
bone, but does not make an impression of direct visualization of the lesion. The present
study is to investigate the usefulness of three dimensional CT(3DCT) studies in the
evaluation of bony defects caused by cholesteatoma.
Materials and Methods : Fifteen cholesteatoma patients who showed bony destruction or
suspicious destruction in the 2DCT were examined using 3DCT. The examination was
carried out in axial or coronal planes with the technical factors of 125 kV, 200 mA, 1
mm thickness, and scanning time of 1 second. The CT data was transferred to a
workstation with a real-time image processor. We used a software(solaris Adw 1.2, Sun
co. USA) enabling image processing. The threshold-based imaging was used for 3D
reconstruction.
Results : In all patients, 3DCT clearly delineated the destruction of bony structures by
cholesteatoma. The 3DCT generated images did provide spatial relationships which were
not easily appreciated on 2DCT. Intraoperative bon destruction findings were correlated
with 3DCT.
Conclusion : The 3DCT could be useful to evaluate the invasiveness of cholesteatoma to
the cranial base. It would be also helpful in planning to reconstruct during surgery.
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KEYWORD
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3DCT, Cholesteatoma, Bone destruction
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