The vast majority of renal cysts are asymptomatic and ordinarily do not require treatment. Renal cysts that grow and obstruct portions of the collecting system, compress normal renal parenchyma, stretch the renal capsule, or spontaneously hemorrhage can cause symptoms. These symptoms include flank or abdominal pain, hematuria, hypertension, infection, or obstructive uropathy (2). In cases of extremely large and/or multiple cysts, such as in patients with autosomal dominant polycystic kidney disease, a palpable abdominal mass may be appreciated on physical examination.

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