Conclusion Correctly understanding and measuring the apex pulmonis companion shadow, it 's good to differentiate from hypertrophic pleura or reading chest films.

结论正确认识及测量正常肺尖及其沿肋骨腋中线内缘的伴影，有助于鉴别胸膜肥厚，对阅读胸片有较大帮助。