Case Report: Synchronous primary high-grade appendiceal mucinous neoplasm and ovarian borderline mucinous cystadenoma: a rare case and diagnostic challenges

This case underscores the diagnostic difficulty in distinguishing synchronous primary mucinous neoplasms from metastatic disease. A multidisciplinary approach, meticulous histopathological examination, and adjunctive immunohistochemistry are critical for accurate diagnosis and appropriate surgical management. This rare coexistence suggests the possibility of shared oncogenic pathways, warranting further investigation. Long-term surveillance is essential for these patients.