Feasibility of Round Window Exposure via External Auditory Canal: Classification and Predictive Landmarks.

ABSTRACT:

Objective

To clarify the feasibility and the anatomical characteristics related to round window exposure via the external auditory canal (EAC) without bony removal.

Methods

Surgical videos and radiological data from 50 adult patients who underwent endoscopic tympanoplasty type I were collected. According to surgical videos, round window niche (RWN) exposure was classified as "Certainly," "Possibly," and "None," and round window membrane (RWM) exposure was classified as "Clear visualization," "Incomplete visualization," "Just perceptible" and "Invisible." Basing on CT reconstruction, distances among RWM, RWN, tympanic annulus (TA), width, and orientation of scala tympani (ST) were measured under the Coordinate System of Cochlea, and anatomic features of EAC under the Coordina

SUBMITTER: Sun J 

PROVIDER: S-EPMC11931666 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature