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Glial heterotopia of the middle ear
1Clinique universitaire d'oto-rhino-laryngologie et de chirurgie cervico-faciale, pôle PALCROS, CHU de Grenoble, hôpital Nord, CS 10217, Grenoble cedex 9, France; Pôle médecine, Université Grenoble Alpes, domaine de la Merci, 38700 La Tronche, France.
Introduction:
Glial heterotopia is defined as the presence of normal glial tissue in an abnormal site.
Case Report:
We report the case of a 63-year-old man who presented with right hearing loss and tinnitus. ENT examination, computed tomography and magnetic resonance imaging showed signs of chronic otitis media. Right mastoidectomy demonstrated a solid mass of the right mastoid and middle ear with no associated dehiscence of the tegmen tympani. Histological examination of the mass revealed normal glial tissue.
Discussion:
Glial heterotopia is a rare entity, which must be distinguished from encephalocele. It is usually an incidental surgical finding when the surgeon observes a mass of the mastoid and middle ear not communicating with the central nervous system. Histological examination confirms the diagnosis by revealing normal glial tissue in the ear.
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