Ovarian tumour is not a single entity, but a complex wide spectrum of neoplasms involving a variety of histological tissues. The most common are the epithelial tumours forming 80% of all tumours. 80% are benign tumours, 10% borderline malignant and 8-10% malignant. Mucinous tumours represent about 8-10% of the epithelial tumours, they may reach enormous size filling the entire abdominal cavity. While mucinous cystadenomas themselves are not infrequent, majority of them (80%) are benign while

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... y 10% of them are borderline and another 10% are malignant. Mucinous tumours of ovary are part of the surface epithelial-stromal tumor group of ovarian neoplasms, and account for approximately 36% of all ovarian tumors. Pseudomyxoma peritonei may present as a result of an ovarian mucinous tumor, however this is a rare cause of this condition, which is a rare condition. A more common cause of pseudomyxoma peritonei is a mucin-producing tumor of the appendix. Here we report a case of 72 years postmenopausal, posthysterectomy patient with huge ovarian mucinous cystadenocarcinoma associated with pseudomyxoma peritoni and mucocele of appendix. Exploratory laparotomy with excision of ovarian tumour and appendix was done. Histopathology report was mucinous cystadenocarcinoma of ovary with metastasis in appendix with fibrosis and calcification. Patient received adjuvent chemotherapy cycles and discahrged in healthy condition.