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【多选题】
以下关于鼓膜出现的症状及疾病正确的是()。A.
鼓室内有积液时，鼓膜色泽粉红、橘黄、琥珀或灰蓝色，有时透过鼓膜可见弧形液平面或气泡
B.
鼓室硬化症时鼓膜增厚或萎缩变薄，出现钙斑
C.
化脓性中耳炎鼓膜穿孔仅为针尖样大小，慢性化脓性中耳炎紧张部穿孔围绕锤骨柄呈肾型，锤骨柄有时赤裸，严重残余边缘，锤骨柄腐蚀
D.
后天原发性胆脂瘤早期在松弛部仅有黄白色饱满感，逐渐出现鼓膜穿孔，透过穿孔的鼓膜可观察鼓室黏膜是否充血肿胀，鼓室内是否有肉芽、钙化、息肉或胆脂瘤等
E.
正常鼓膜呈半透明乳白色，急性炎症时鼓膜充血、肿胀
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