Glomus jugulare tumor is a slow-growing neoplasm that is often found incidentally. It arises within the jugular foramen of the temporal bone, near the opening of the foramen magnum (the large hole at the base of the skull where the spinal cord and brainstem connect). The jugular foramen contains the cranial nerves IX, X, and XI and patients will often present with symptoms associated with impairment of the normal function of these nerves, such as difficult swallowing or ear/hearing problems.
For further study on this topic and others related to neuropathology and neuroanatomy, the following books come highly recommended, and a small portion of the proceeds (or any Amazon purchase through these links) help with expenses of hosting this site:
Adventures in Neuropathology 
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