Parapelvic cysts are found in approximately 1.25–1.50% of autopsy cases . Unlike simple renal cysts, they do not lie within the renal parenchyma. They are located on, or probably originate in, the hilus of the kidney in close proximity to the pelvis and major calyces .They are thought to be lymphatic in origin and may be congenital . Their appearance in an intravenous urogram (IVU) is similar to that of renal sinus lipomatosis and in sonography it is similar to hydronephrosis. Some signs have previously been described to help differentiate these cysts from hydronephrosis in ultrasound imaging. We present a case of bilateral parapelvic cysts in which conventional sonographic criteria could not help to make diagnosis.
Pelvis is a area where all renal units accumulate. Pelvis is used to collect all the urine and then urine is delivered into ureter, which is connected with pelvis. Through ureter, urine is delivered into bladder, and then discharge out of body. In a word, pelvis is used to collect urine.
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