Primary retroperitoneal mucinous cystadenoma: A case report

Figure 1 Contrast-enhanced computed tomography scan in the sagittal section showing the retroperitoneal tumor with homogeneous features.

Figure 2 Multidetector computed tomography exam with 3D reconstruction and volumetry. Imaging revealed an oval, well-delimited, cystic lesion located in the left retroperitoneal space that measured 12.3 cm × 10.8 cm in size (volume: 858 mL) without infiltration of surrounding structures.

Figure 3 Surgically excised retroperitoneal mass.

Figure 4 Histopathology. Hematoxylin eosin staining of the excised tumor revealed a single layer of mucin-producing columnar epithelium with underlying fibrous connective tissue (A, magnification × 14); Rare papillation was observed without invasion (B, magnification × 20).

Figure 5 Immunohistochemistry. Immunoreactive expression of Mucin (MUC) 1 (A); MUC2 (B); MUC5AC (C); and CDX2 (D) (magnification × 20).