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Parapelvic Cysts of the Kidney
Definition of Renal Parapelvic Cysts
Parapelvic cysts of the kidneys are simple renal cysts, which are adjacent to the renal pelvis or the renal sinus.
Etiology of Parapelvic Cysts
Lymph vessel cysts
Typical parapelvic cysts are multiple and most probable derive from lymphatic vessels, often associated with nephrolithiasis or urinary obstruction.
Simple renal cysts
Parapelvic cysts may also derive from the renal parenchyma adjacent to the renal pelvis. These cysts derive from the nephron.
Signs and Symptoms
Normally, there are no complaints. Parapelvic cysts can compress the pyelocaliceal system or ureter, cause flank pain or lead to other symptoms of urinary obstruction.
Diagnostic Work-Up of Parapelvin Cysts
Renal ultrasound should be sufficient for the diagnosis; in doubtful situations an intravenous pyelography, CT Abdomen or renal scintigraphy can rule out urinary obstruction.
Differential Diagnosis of Parapelvic Cysts
Hydronephrosis (upper urinary tract obstruction).
Treatment of Parapelvic Cysts
Treatment of parapelvic cysts is rarely necessary, see section simple renal cyst.
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Israel, G. M. & Bosniak, M. A.
An update of the Bosniak renal cyst classification system.
Urology, 2005, 66, 484-488
Deutsche Version: Parapelvine Nierenzyste