Abstract
INTRODUCTION: About 5% of ovarian cancers are so poorly differentiated and difficult to classify that they are called undifferentiated carcinomas and usually have disseminated disease at presentation. Extra pelvic debulking it is difficult to complete. PRESENTATION OF CASE: We report a case of a rare ovarian tumor presented as a large mesenteric tumor of 14cm diameter in a 73 years old woman. DISCUSSION: Undifferentiated carcinomas are usually large, solid with hemorrhage and necrosis, bilateral and most are difficult to classify histologically. Rarely are pure, generally identified through the extensive sampling of lesions, some other components of surface epithelial carcinoma and usually the predominant element is the latter. Cases with predominantly undifferentiated component are rare. CONCLUSION: The treatment and diagnostic approach is the same as for other high-grade epithelial tumors of the ovary, but in this particular case the differential diagnosis and diagnostic approach is that of a mesenteric tumor.