These are rare, slow-growing, very vascular tumours of a group called paragangliomas. They are derived from glomera jugulare (or glomus bodies) which themselves are derived from neural tissue and arise within the jugular foramen of the temporal bone
-Rare tumour (the annual incidence is around 1 in 1.3 million people per year)
-They tend to present between 40 and 70 years of age (range: 6 months to 88 years)
-There is a female preponderance of between 3 and 6:
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