主动脉窦动脉瘤是非常少见的，可以是先天性或后天性的。
Introduction Valsalva sinus aneurysms are rare and can be either congenital or acquired.
听力下降是后天性原发性胆脂瘤的首诊症状。
Decrease in acouesthesia might be the first diagnosed symptom of acquired primary cholesteatoma;
听力下降是后天性原发性胆脂瘤的首诊症状。
Decrease in acouesthesia might be the first diagnosed symptom of acquired primary cholesteatoma;
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