Figure 1. Non-contrast computed tomography revealed diffusely swollen liver with obscure vessel structures (a), a mass in the pancreatic tail (circle) (b), and ascites around the gall bladder and liver (arrows) (c).
Figure 2. An autopsy revealed a tumor measuring 4 × 2 × 2 cm in the pancreatic tail accompanied by hemorrhage (a) and multiple sponge-like tumors in the liver (b). Microscopic specimens of the pancreatic tumor (c) and liver metastases (d) revealed proliferation of sarcomatoid atypical cells (comprising spindle, pleomorphic, and giant cells) accompanied by red blood cells, necrosis, and fibrosis.
Figure 3. Immunohistochemical staining of the tumor was positive for cytokeratin (CK) AE1/AE3 and CK 7 and negative for CK 20, suggesting the tumor derived from epithelial tissues (a: CK AE1/AE3; b: CK 7; c: CK 20).