MORPHOLOGICAL CHARACTERISTICS OF MIDDLE EAR CHOLESTEATOMA IN PEDIATRIC PATIENTS AT THE NATIONAL EAR, NOSE AND THROAT HOSPITAL FROM JUNE 2020 TO OCTOBER 2025. YHCĐ [Internet]. 2026 Apr. 2 [cited 2026 Sept. 8];67(CĐ3-NCKH). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/4728