图示乳头状浆液性囊腺癌。 内表面可见许多乳头状突起。良性的囊腺瘤和恶性的囊腺癌的病变界限并不十分分明。虽然病变可能并不是明显的恶性，但通常按恶性对待。
This is a papillary serous cystadenocarcinoma. Note the many papillations on the inner surface. Between benign cystadenomas and malignant cystadenocarcinomas lies the grey zone of "borderline" lesions that are not clearly malignant, but are treated as though they could be.