PMC3658227_01
A) Computed tomography of the abdomen shows a retroperitoneal mass in the right anterior pararenal space (transverse cross section). B) Photograph of the gross specimen shows the cyst wall.
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A) The cystic wall was lined by cuboidal epithelial cells (H&E stain, 80x). B) The epithelial cells were immunoreactive with EMA (EMA stain; original magnification, 160x). C) A strong immunopositivity was found also with CK AE1/AE3 (CK AE1/AE3 stain; original magnification, 80x). D) CK18 revealed an evident immunostaining in cuboidal epithelial cells (D) (CK AE1/AE3 stain; original magnification, 160x).. Abbreviation: H&E, hematoxylin and eosin.
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Gross examination of the specimen showed a collapsed, previously opened, dark gray to brown colored, unilocular, thin-walled cyst measuring 40 x 60 mm (Figure 2).