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Radical Mastoid Cavity

Figure 10.2 The infralabyrinthine type of petrous bone cholesteatoma is usually encountered in an old radical mastoid cavity. It is localized in the region of the hypotympanum and the infralabyrinthine air cells. It may extend posteriorly towards the posterior cranial fossa or anteriorly towards the internal carotid artery, petrous apex, and clivus.

Figure 10.2 The infralabyrinthine type of petrous bone cholesteatoma is usually encountered in an old radical mastoid cavity. It is localized in the region of the hypotympanum and the infralabyrinthine air cells. It may extend posteriorly towards the posterior cranial fossa or anteriorly towards the internal carotid artery, petrous apex, and clivus.

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