An intensely enhancing hyperdense lesion is seen involving the left jugular foramen, measuring approximately 3.5 x 3.5 x 3.5 cm. The lesion is causing destruction and widening of the jugular foramen.
Medially, the lesion has intracranial extradural extension in the posterior fossa, indenting the cerebellar cortex.
Laterally, the lesion extends into the middle ear cavity (epi, meso, and hypotympanum) and external auditory canal. There is erosion of the long process of the incus, the inferior semicircular canal, the basal turn of the cochlea, and the lateral wall of the tympanic segment of the facial nerve.
The lesion infiltrates the jugular bulb, and inferiorly extending into the proximal jugular vein. Posterior inferiorly, there is the destruction of the basiocciput and lateral aspect of the foramen magnum.