A 62-year-old fat lady was admitted to the hospital complaining of vague, on and off abdominal pain for 3 years which became more severe from the last 3 months. On physical examination, no abnormalities were found. Ultrasonography of the abdomen revealed a huge cystic mass with thick rim in left retroperitoneal area. In intravenous pyelography, densely calcified lesion were seen on the left upper quadrant of the abdomen (Fig. 1, white arrow) pushing the left ureter medially (Fig. 1, black arrows). Computed Tomography (CT) scan of the abdomen demonstrates cystic lesion with thick peripheral wall calcification (Fig. 2). Liver and other abdominal organs did not have any lesions. Chest X-ray was normal too. There were no cysts in the liver and lungs. Avoiding the possible danger of ecchinococcal dissemination and/or anaphylactic reaction, we do not perform fine-needle aspiration biopsy of the mass. Although there are no specific signs or symptoms for the exact diagnosis of renal echinococcosis, without any abdominal abnormalities, pain attributes to the pressure effect of the mass.
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