Parapelvic cyst is a kind of benign cysts originating from the renal parenchyma of renal hilus, which does not connect with the collection system. The cause of it is lymphectasia which is probably the result of chronic inflammation. Parapelvic Cyst, mainly related to the oppression of renal collecting system or renal pedicle arteries and complications of cysts, have symptoms of backache, hypertension, hematuria and urinary tract infections etc. Whether those symptoms will occur is largely relevant to the cyst’s location, size and complications.
Symptoms of Parapelvic Cysts on kidney
-frequent urination
-back pain, lumbar pain or discomfort
-blood in urine, brown, pink or red urine
-high blood pressure
-edema
Patients are usually in their fifth or sixth decades and are almost always asymptomatic. There are rare instances of obstruction of a collecting system. Pathogenesis is not established; however, lymphatic ectasia is proposed, possibly secondary to lymphatic obstruction. Sonography will show multiple echo-free areas in the region of the renal sinus. Differentiation from hydronephrosis may be difficult and renal sinus cysts are one of the most common causes of a false positive diagnosis of hydronephrosis on ultrasound. A diagnosis of hydronephrosis is established without question when dilated calyces are seen to communicate with a dilated renal pelvis.
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