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鼓膜内陷形成囊袋,囊袋内堆积表层上皮及角化物质而形成的胆脂瘤,称为()
A . 先天性原发性胆脂瘤
B . 先天性继发性胆脂瘤
C . 后天性原发性胆脂瘤
D . 后天性继发性胆脂瘤
E . 上述都不是
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