Figure 1. Microscopic findings of the patient's lung biopsy specimen.

Poorly differentiated sarcomatoid-like spindle cancer cells. (A, hematoxylin and eosin, 400X). Both the lung tissue and cancer cells (B, hematoxylin and eosin, 200X)

Poorly differentiated sarcomatoid-like spindle cancer cells. (A, hematoxylin and eosin, 400X). Both the lung tissue and cancer cells (B, hematoxylin and eosin, 200X)