This is the CT scan of a patient with keratosis obturans in which pressure from the accumulating keratin squames has caused erosion into the mastoid bone.
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![Automastoidectomy secondary to Keratosis Obturans [CT Scan]](https://medtube.net/images/min/b52d73b17355a483ddbf96bb9cf7e93a/149/112/1 "Automastoidectomy secondary to Keratosis Obturans [CT Scan]")