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J Can Assoc Radiol. 1984 Sep;35(3):283-6.

Ultrasonographically indeterminate renal parapelvic masses.


Ultrasonography is excellent in the evaluation of renal masses. Simple cysts can be distinguished from more complex or solid renal masses. Rarely, sonographic examination cannot be used to categorize renal masses, particularly those that are small and in a parapelvic location. We report six patients having sonographically indeterminate parapelvic masses. Subsequent computed tomographic examination demonstrated each of these masses to be a parapelvic cyst. Failure to make an ultrasonographic diagnosis was thought to be due to their parapelvic location. Complex interactions between cyst and normal renal sinus structures caused alteration and distortion of the anatomy of both, making exact diagnosis difficult. Computed tomography can be used to define the anatomy precisely and provide the correct diagnosis.

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