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Letter to the editor: A case report of primary retroperitoneal hydatid cyst.

To the Editor, Retroperitoneal location of hydatid cyst is encountered rarely, even in endemic areas. A 45year-old woman presented to our hospital with flank and back pain, weight loss and fatigue. Ultrasonography revealed a solid mass in the right retroperitoneum. Computerized tomography (CT) of the abdomen showed a well defined 15x5 cm sized low attenuation heterogeneous mass extending from the lower pole of the right kidney down to the lateral pelvic wall and closely related to the iliopsoas muscle (Figure 1).