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a Right ear with advanced congenital cholesteatoma showing involvement of the mesotympanum anterior and posterior to the malleus that appears to separate the lesion into halves. b Discrete nodule of left ear cholesteatoma at anterosuperior portion of mastoid found in the epitympanic region-aditus ad antrum, wedged between the posterior bony external auditory canal wall (at left) and the tegmen mastoideum (at right)
