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CT T-bone Otospongiosis

Exam: Thin axial sections were acquired through the temporal bones using the high definition bone algorithm without use of contrast. Coronal reformations were performed. Findings: Left temporal bone: The external auditory canal is normal. The mastoid air cells are well aerated.The middle ear cavity and ossicles appear normal. There is a subtle lucency noted in the fissula ante fenestram. Inner ear structures, semicircular canals and the internal auditory canal otherwise appear normal. The facial nerve course and vascular foramina appear normal. Right temporal bone: The external auditory canal is normal. Sclerosis is noted in the inferior right mastoid tip, consistent with minimal arrest of pneumatization. The middle ear cavity and ossicles appear normal. There is a subtle lucency noted in the fissula ante fenestram. Inner ear structures, semicircular canals and the internal auditory canal otherwise appear normal. The facial nerve course and vascular foramina appear normal. Other osseous and soft tissue structures are unremarkable. Impression: Possible early otospongiosis based on subtle bilateral lucencies in the fissula ante fenestram bilaterally.