Vol.46, No.1:83-86, February 2012 Case reports http://dx.doi.org/10.4132/KoreanJPathol.2012.46.1.83 Urachal Mucinous Tumor of Uncertain Malignant Potential: A Case Report Jung-Woo Choi · Ju-Han Lee Young-Sik Kim Department of Pathology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea Urachal mucinous tumor of uncertain malignant potential is very rare and is characterized by a multilocular cyst showing the proliferation of atypical mucin-secreting cells without stromal invasion. As in ovarian and appendiceal borderline tumors, it represents a transitional stage of mucinous carcinogenesis in the urachus. In addition, this tumor may recur locally and develop into pseudomyxoma peritonei. Due to its scarcity and diagnostic challenges, we report a mucinous tumor of uncertain malignant potential arising in the urachus. Key Words : Urachus; Mucinous cystadenoma

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