拔牙时所使用的高速牙科电钻可能使得气体进入软组织，进而导致皮下气肿及纵膈气肿。
The use of a high-speed dental drill may introduce air into the soft tissue and lead to subcutaneous emphysema and pneumomediastinum.
CT示软组织密度肿块或结节12例，囊肿样病变9例，病灶周围肺气肿。
CT revealed a soft tissue mass or nodule (12 cases), cyst lesion (9 cases), with emphysema around the pulmonary sequestration.
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