Ovarian metastases from primary colorectal cancer are reported to be present in 6% (3-8%) of women who have undergone colorectal resection. In Japan, among primary lesions that metastasize to the ovary, gastric cancer is the most frequent, followed by breast cancer and colon cancer. In general, ovarian metastasis from colon cancer is more frequently simultaneous than meta-chronous. It is difficult to diagnose preoperatively, because there are no highly specific radiological features that can differentiate between primary and metastatic ovarian masses. However, differentiation between primary ovarian cancer and ovarian metastasis is important in order to prevent inappropriate management and suboptimal treatment. In most cases of ovarian metastasis, the primary tumor site is indicated by histopathological examination of the ovary.
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Last date updated on April, 2026