Abstract
Neoplasms may involve the middle ear, the mastoid and the temporal bone, metastatically or by extension from adjacent sites such as the postnasal space, external auditory meatus (EAM), parotid gland or even from structures within the cranial cavity. Nager (1967) has reported five forms of glioma which produced temporal bone erosion. Acoustic neuroma is the most common tumour to erode the temporal bone but it is most unusual for this neoplasm to cause any radiological abnormality of the temporal bone, other than expansion of the IAM. Tumours in the VHIth nerve and arising in the IAM and region of the cerebello-pontine angle will be considered in Chapter 9.
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