<![CDATA[Introduction: Neoplastic ovarian cyst is a product of an abnormal growth of ovarian cells. WHO (2005) designate borderline tumors as an atypical growth lacking both benign and malignant attributes. Borderline Surface Epithelial Tumor (SET) prevalence occurs around 15 – 20%, whereas 10 -13% were serous and 5 – 7% mucinous. Case Illustration: Fifty-seven years old P6A0 female was admitted to the emergency department of M. Ashari General Hospital with lower abdominal pain and urinary retention. The complaints started in the last 27 hours earlier. Ultrasound examination showed a 9.52x11.53x11.43 cm multiloculated cyst mass with septum on the upper left aspect of uterus. Bilateral salphingo-oophorectomy, radical hysterectomy, omentectomy, appendectomy and peritoneal washing were performed. Histopathological exam was conducted, concluding the patient had mucinous ovarian cystadenoma (borderline) with pseudomyxoma peritoneum. Discussion: Ovarian Cystadenomas is a neoplastic cyst originating from epithelial tissues of the ovary. Incidence were at peak on the 6th to 7th decade of life. The patient underwent surgery procedure, histopathology department reported the patient had mucinous ovarian cystadenoma (borderline) with pseudomyxoma peritoneum on the appendix. Conclusion: Histopathology examination showed the patient had mucinous ovarian cystadenoma (borderline) and pseudomyxoma peritoneum. The tumor was borderline due to polymorphic nucleus, irregular cell hyperplasia without stromal involvement.]]>
