case_images: PMC4531569_01
case_images: Abdominal CT showed the retroperitoneal mass had displaced the right colon medially and this encapsulated cystic mass contained fluids.
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case_images: It was an encapsulated cystic mass that contained fluids, and there was no lesion in the pelvic organs (Figure 1).
case_images: Multilocular cyst lined by a single layer of tall columnar cells. The stroma consisted of fibrocollagenous tissue with no pancreatic or ovarian components (H & E, x40).
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case_images: On the histologic examination, the cyst was lined by a single layer of tall columnar epithelium with clear cytoplasm and small nuclei that were basely located in the cells (Figure 2).
case_images: The cells had clear cytoplasm and basely located small nuclei with no cytologic atypia (H & E, x200).
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case_images: No pancreatic or ovarian components were found (Figure 3).
case_images: On immunohistochemical staining, the lining cells showed positive reactions to CAM 5.2 (x200).
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case_images: Immunohistochemical staining showed that the lining cells were positive for cytokeratin, cytokeratin 7, CAM 5.2, and carcinoembryogenic antigen, but the cells were negative for cytokeratin 19, epithelial membrane antigen, estrogen and progesterone (Figure 4).