肺转移性癌一般较少呈现呼吸道症状和痰血，痰细胞学检查不易找到癌细胞。
Metastatic lung cancer in general showed less respiratory symptoms and sputum blood, sputum cytology is not easy to find cancer cells.
转移性未分化癌，尤其是小细胞间变型，大多来自肺。
Most of the metastatic undifferentiated carcinomas are from lungs, especially the anaplastic carcinomas of small cell type.
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