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A 47-year-old man had chronic eustachian tube dysfunction and studies were obtained to rule out recurrent cholesteatoma. (A) Axial temporal bone computed tomography demonstrating opacification of the bilateral mastoid air cells and middle ear. (B) Acute diffusion coefficient map with decreased signal in the right mastoid air cells. (C) Echo-planar diffusion-weighted image demonstrating a focus of bright signal consistent with recurrent cholesteatoma in the right mastoid air cells.
