Abstract
Various problems on the cytodiagnosis of lung cancers, such as following respects, were presented and discussed from a practical point of view.
1. Situations disturbing cancer cell collection induced by extraordinary causes.
i) Extensive necrosis of giant cell carcinoma.
ii) Wide-spreading of bronchiolo-alveolar adenocarcinoma through the alveolar epithelium to the another lobes of lung.
iii) Unsuspected intrabronchial extension of malignant thymoma.
2. Collection of two or three kinds of cancer cells due to the rare causes.
i) Metaplastic changes of small cell anaplastic carcinoma.
ii) Paradoxical exfoliation of different kinds of cancer cells from large cell anaplastic carcinoma.
iii) Pulmonary blastoma and carcinosarcoma.
The situation of these extraordinary cancer cell collection from pulmonary malignancies were discussed with showing many cytologic and histologic features of own cases.
