[Quantitative analysis of cholesteatoma using high resolution computed tomography]

Area of Science:

• Otolaryngology
• Medical Imaging
• Radiology

Background:

• Cholesteatoma, a destructive keratinizing squamous epithelium in the middle ear, presents diagnostic challenges.
• Understanding its spatial relationship with middle ear structures is crucial for surgical planning and prognosis.

Purpose of the Study:

• To quantitatively assess middle ear cavity dimensions in adult cholesteatoma using high-resolution computed tomography (HRCT).
• To compare these dimensions between cholesteatoma subtypes (pars flaccida and pars tensa) and chronic otitis media with central perforation (COM).

Main Methods:

• HRCT scans (axial and coronal) of 73 adult cholesteatoma cases and 60 COM controls.
• Classification of cholesteatoma into subtypes based on antral extension.
• Measurement of middle ear cavity dimensions, including attic, malleus-to-wall distances, aditus ad antrum, and antrum dimensions.

Main Results:

• Significantly wider attic in both pars flaccida and pars tensa cholesteatoma compared to COM.
• Pars flaccida cholesteatoma showed increased malleus-to-lateral attic wall distance; pars tensa showed increased malleus-to-medial attic wall distance.
• Cholesteatoma with antral extension demonstrated significantly larger aditus ad antrum and antrum dimensions compared to COM, while those without antral extension showed no significant difference.

Conclusions:

• HRCT provides quantitative verification of bone destruction in cholesteatoma.
• Middle ear cavity enlargement, particularly with antral extension, is a key CT finding in cholesteatoma.