In the cases of mastoidectomy, the cavity of attic, antrum and facial recess should also be filled in order to avoid suction pocket and cholesteatoma formation.

• 同时填充封闭上鼓室、鼓窦，以防回缩袋形成，减少胆脂瘤复发的潜在危险，乳突皮质骨粉为理想填充材料。