TY - CHAP M1 - Book, Section TI - Cholesteatoma A1 - Chang, C. Y. Joseph A2 - Lalwani, Anil K. PY - 2020 T2 - Current Diagnosis & Treatment Otolaryngology—Head and Neck Surgery, 4e AB - ESSENTIALS OF DIAGNOSISSquamous epithelium in the middle ear or mastoid.Otorrhea and conductive hearing loss.Retraction of the tympanic membrane (TM) with a squamous debris collection or a whitish mass behind an intact TM or perforation.Testing includes computed tomography (CT) scanning, which can be useful in delineating disease extent but is not critical to making a diagnosis in most cases, and magnetic resonance imaging (MRI) with nonechoplanar diffusion-weighted imaging, which can differentiate cholesteatoma from other tissues and fluid. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1169079559 ER -