由于有支气管动脉供血维持组织活性，故坏死较少见。
Necrosis is relatively uncommon because tissue viability is maintained by the bronchial arterial blood supply.
在肿块型3例4个肿块中，支气管充气征3个，伴不规则坏死空洞2个；
Of the 4 mass-type foci in 3 cases, 3 had air bronchogram sign and 2 had irregular necrosis cavities.
当存在广泛的干酪性坏死并且肉芽肿累及较大的支气管时，大量的坏死物排出，留下空洞。
When there is extensive caseation and the granulomas involve a larger bronchus, it is possible for much of the soft, necrotic center to drain out and leave behind a cavity.
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