Gastric choriocarcinoma admixed with an α-fetoprotein-producing adenocarcinoma and separated adenocarcinoma

Figure 1 Gross pathology showed a 5. 8 cm × 3.2 cm ulcerofungating mass in the antrum, with extensive hemorrhage and light gray fibrosis, and a 2.5 cm × 2.0 cm ulcerative lesion.

Figure 2 Microscopically, massive numbers of pleomorphic, bizarre tumor cells with hemorrhage were revealed: syncytiotrophoblasts and cytotrophoblasts (HE, A × 40, B × 100).

Figure 3 Immunohistochemical staining showed positive immunoreactivity for β-human chorionic gonadotropin (A) and focal positivity for α-fetoprotein (B).