Fig. 4

Pathological findings of the tumor. Macroscopically, the cut surface revealed a multilocular mass with areas of hemorrhage, necrosis, and a mucinous substance (a). Microscopically, the tumor was composed of pleomorphic and polynuclear dyskaryotic cells, and mesenchymal hamartoma-like lesions were partially seen (hematoxylin and eosin stain) (b). The cytoplasm of the polynuclear dyskaryotic cell contained eosinophilic globules that were diastase-resistant PAS positive (PAS stain) (c)