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Gross and microscopic morphology of the lesions in the peritoneum. (A) Cut surface of the left lower abdominal lesion. Milky whitish and multinodular mass is observed. (B) Histopathological image of representative lesion: atypical cells with large nuclei and clear or pale eosinophilic cytoplasm forming papillary structures. (C) and (D) IHC analysis of the tumor: Tumor cells are positive for (C) napsin A in the cytoplasm and (D) PAX8 in the nucleus. Original magnification: ×200.
