Figure 2

Microscopic findings of the tumor (HE ×100). A: Solid pattern (major component of the tumor); B: bronchioloalveolar papillary pattern; C: severe lymphatic invasion; D: sarcomatous pattern with immunohistochemical expression of epithelial marker (not shown); E: paucicellular osteoblastic pattern; F: metastasis involving the myocardium.