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Axial high-resolution computed tomography (HRCT) views of representative cases of osteoma. (A) Pedunculated osteoma (B) Broad-based osteoma. White arrowhead indicates that the osteoma had an obvious stalk attached to the ear canal. White arrow indicates that the osteoma had a broad base. Black arrowhead means concurrent cholesteatoma invaded the bony wall of external ear canal.
