Solitary simple cyst. Large solitary cyst found incidentally at ultra-sonography (longitudinal scan) in the lower pole of the right kidney. Criteria for the diagnosis of simple cyst include absence of internal echoes, rounded outline, sharply demarcated, smooth walls, bright posterior wall echo (arrows). The latter occur because less sound is absorbed during passage through cyst than through the adjacent parenchyma. If these criteria are not satisfied, computed tomography can rule out complications and other diagnoses.

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