CT - Skull base
Axial left
Coronal left
Axial right
Coronal right
Irregular bone erosion (moth-eaten appearance) is seen at the margins of the left jugular foramen with the soft-tissue mass extending into the middle ear cavity at the cochlear promontory. The bone erosion and growth pattern are typical features of glomus jugulotympanicum paragangliomas and are useful to help distinguish between schwannoma which will cause smooth remodeling of the foramen.