The inner ear structures, including the semicircular canals, vestibule, and cochlea are unremarkable. The vestibular aqueduct is not enlarged. The mastoid air cells are well pneumatized and clear. No definite abnormality is seen in the visualized portion of the brain parenchyma. There is mucoperiosteal thickening in the bilateral maxillary and bilateral sphenoid sinuses, left greater than right.