PMC5943841_01
Chest computed tomography-enhanced images of the (A) lung window and (B) mediastinal window. A nodule with a well-circumscribed margin and a heterogeneous enhancement pattern was observed in the left upper lobe in proximity to the left chest wall. Some pulmonary small arteries were observed at the edge of the nodule (B).
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F1
Chest contrast-enhanced CT was performed at our hospital, revealing a 2.0-cm nodule in the left upper lobe, next to the left chest wall, and the broad basement of the nodule was in proximity to the chest wall (Fig. 1A). In the mediastinal window, the lesion showed a well-circumscribed margin and a heterogeneous enhancement pattern; additionally, some pulmonary small arteries were observed at the lesion's edge (Fig. 1B).
Histological features of the case. (A) Microscopic examination revealed that the tumor was composed of bundles of ovoid cells and spindle cells arranged in whorls (hematoxylin and eosin, 100x). (B) Immunohistochemistry analysis showed tumor cells with positive staining for epithelial membrane antigen (100x).
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F2
Immunohistochemical staining demonstrated consistent expression of epithelial membrane antigen vimentin (Vim) (Fig. 2B), and Ki-67 staining was negative.