Figure 3.

(a) In case no. 3, multiple foci were found in the removed lobe, the largest being 3 mm. Although they did not have encapsulation, they were typically well demarcated and composed of mild spindle cells, which were arranged in a swirl. The cells had no obvious atypia, and no mitotic figures were found (arrowhead) (hematoxylin and eosin stain, original magnification ×200). On immunohistochemical staining, the cells were (b) positive for EMA (obvious staining) and (c) vimentin (dense staining), and (d) negative for TTF‐1. (e) Computed tomography appearance of the corresponding pulmonary nodule (red circle).