Özet:

The retroperitoneal cysts which have mesothelial origin are very rare. Surgery is the standard method for definitive diagnosis and treatment of retroperitoneal cysts At the time of diagnosis it is difficult to seperate from other retroperitoneal masses. Ten-year-old girl was operated with the diagnosis of left nonfunctional hydronephrotic kidney. In macroscopic examination at the edge of the cyst about 2 cm of tissue was hypoplastic kidney. In histopathological examination, cyst wall was paved with a single row of cubical epithelium and immunohistochemically cytoceratin 7 + , WT-1 + , calretinin + was detected and the cyst was diagnosed as mesothelial cyst. Two centimeters kidney tissue was assessed in accordance with hypoplasic kidney.Here we present a case of primary retroperitoneal mesothelial cyst, which is very rare in the literature

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