As for recurrence, the avoidance of a too-large postoperative tympanomastoid space, the establishment of a patent epi-mesotympanic route, and the preservation of adequate middle ear mucosa should be emphasized.

• 而避免术后中耳乳突腔过大，使上、中鼓室交通良好，以及尽量保持完整的中耳黏膜层，则是防止鼓膜再凹陷，再度形成胆脂瘤的良方。