RT Book, Section A1 Chang, C. Y. Joseph A2 Lalwani, Anil K. SR Print(0) ID 1169079559 T1 Cholesteatoma T2 Current Diagnosis & Treatment Otolaryngology—Head and Neck Surgery, 4e YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9780071847643 LK accessmedicine.mhmedical.com/content.aspx?aid=1169079559 RD 2024/04/24 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.