We present a rare case of synchronous mucinous borderline tumor of the
ovary and low-grade appendiceal mucinous neoplasm (LAMN). We performed a left
adnexectomy to diagnose the left ovarian borderline malignancy and an ileostomy
because of the swollen appendix during the operation. It was diagnosed as left
ovarian mucinous borderline malignancy and LAMN. LAMN causes peritoneal
dissemination, ovarian metastasis, and peritoneal pseudomyxoma. The appendix
and ovary are close to each other anatomically and can metastasize if there is
a tumor in either. For ovarian mucinous tumors, it is necessary to search the
gastrointestinal tract, especially the appendix, as the primary lesion. For
appendix tumors, it is necessary to search for the ovary. Since LAMN may be
associated with borderline ovarian malignancies, as in this case, there is a
possibility of the duplication of tumors when searching for ovarian mucinous
tumors as the primary tumor and if ovarian tumors are found. Since LAMN and
mucinous ovarian tumors have similar histological features, immunohistochemical
staining is useful for their differentiation because they show different
immunostaining patterns.
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