病变早期为小结节状，晚期形成侵蚀性溃疡，病程缓慢，很少转移。
Its shape changes from small nodule in the early stage to erosive ulcer in the later.
病程多不相同，常呈缓慢进行性且没有早发型亚历山大病严重。
The course is variable, usually slowly progressive and less severe than the AD forms with earlier onset.
肺部良性肿瘤一般不呈现临床症状，生长缓慢，病程长。
Pulmonary benign tumor generally does not show clinical symptoms, slow growth, long course.
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