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Noncontrast CT scan of the ears in axial (A) and coronal (B) views showing a ground-glass appearance petromastoid expansive bony mass (white arrows) with multiple cystic areas (red arrows) measuring 60 × 50 × 40 mm, narrowing the internal and external auditory canals. The scutum, cochlea, vestibule, and semicircular canals appeared normal.
