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High resolution bone algorithm CT scans. Erosive expansile lesion of the right temporal bone, involving the mastoid antrum, with complete erosion of the tegmen (short arrows) and partial erosion of the cortex of the lateral semicircular canal (arrowheads) can be seen. The lesion extends throughout the attic, sparing the ossicular chain (long arrow).
A, Axial view.
B, Coronal view.
