PROFESSOR TONY WRIGHT, INSTITUTE OF LARYNGOLOGY & OTOLOGY / SCIENCE PHOTO LIBRARY PROFESSOR TONY WRIGHT, INSTITUTE OF LARYNGOLOGY & OTOLOGY / SCIENCE PHOTO LIBRARY
Congenital cholesteatoma of the ear canal, otoscope view. This rare condition (present from birth) occurs when the squamous epithelium in the middle ear (the so-called epidermoid formation) fails to regress as normally occurs. Instead, it develops into a slowly growing mass of shed squamous cells (keratin, swelling at upper left) surrounded by a thin layer of actively dividing squamous epithelium. This example, in a 2-year-old child, was surgically removed.
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