SKULL: Base of Skull

A-27Erosion of the Sphenoid Wing
A-28Erosion of the Petrous Ridge, Pyramid, or Apex
A-29Erosion or Widening of the Internal Auditory Meatus
A-30Dense Temporal Bone Lesion
A-31Neoplasm Involving the Temporal Bone
A-32Small or Irregular Foramen Magnum
A-33Enlarged Foramen Magnum