Renal sinus cyst
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It is worth noting that some authors 5,6 use the term renal lymphangiectasia interchangeably. It is likely that true renal lymphangiectasia is a separate and rare disorder, and is thus discussed separately.
Renal sinus cysts are benign. They can be subdivided into
parapelvic cysts: originate from the adjacent parenchyma and protrude into the renal sinus
peripelvic cysts: originate within the sinus itself and have a lymphatic origin
These are simple renal cysts that plunge into the renal sinus from the adjacent renal parenchyma. They are usually single or few and resemble simple renal cortical cyst in morphology. A parapelvic cyst at times may cause compression of the pelvicalyceal system resulting in hydronephrosis. They may also mimic hydronephrosis, termed pseudohydronephrosis.
These are frequently bilateral. They appear as fluid-density cysts closely abutting the pelvis and infundibula, rarely cause functional renal derangement by compression. When followed up they remain unchanged in size. They may be confused with hydronephrosis on NECT and ultrasonography, but on CECT the differentiation is obvious.
hydronephrosis: renal sinus cysts can mimic hydronephrosis on ultrasonography or non-contrast CT, especially pelviureteric junction obstruction as both have enlarged fluid-filled pelvicalyceal systems and normal ureter but CT IVP studies will demonstrate a normal or narrowed/stretched/displaced (but not dilated) collecting system
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