Figure 9
From: Ovarian carcinomas, including secondary tumors: diagnostically challenging areas

Anaplastic carcinoma in mucinous cystic tumor. The epithelial lining of the cyst appears as borderline malignancy (top). The undifferentiated component is characterized by a diffuse arrangement of cells with abundant eosinophilic cytoplasm and grade 3 nuclei (Figure 7-38 from Prat J. Pathology of the Ovary. Saunders: Philadelphia, 2004). Reproduced with permission.