Evaluation of simple or complex kidney cysts (Bosniak I-IV) detected on ultrasound and CT, with follow-up or surgical treatment based on risk classification.
Indication
- Large simple renal cyst causing flank pain, hematuria, or hypertension
- Cyst rapidly growing or causing compression findings on follow-up imaging
- Findings suggesting infection or bleeding within the cyst
- Complex cyst classified as Bosniak II-F that requires close follow-up
- Complex cyst classified as Bosniak III or IV with malignant potential
- Polycystic kidney disease in which renal function is affected by multiple large cysts
- Detection of a significant cyst in patients with a single kidney or transplanted kidney
Preparation
- Up-to-date blood tests (creatinine, complete blood count, coagulation) and urinalysis
- Detailed imaging: contrast-enhanced computed tomography (CT) or magnetic resonance (MR)
- Discontinuation of aspirin and other blood thinners at the time planned by the physician
- If surgery is planned, anesthesia consultation and necessary cardiac/pulmonary tests
- Avoid eating and drinking for 6-8 hours before the procedure (for procedures requiring general anesthesia)
How it's performed
- In Bosniak I-II simple cysts without symptoms, intermittent imaging follow-up is performed
- Ultrasound-guided percutaneous puncture and sclerotherapy may be applied for large simple cysts causing compression
- Laparoscopic cyst decortication (removal of the cyst roof) is preferred for recurrent or symptomatic cysts
- Partial nephrectomy (removal of the cystic mass) is planned for Bosniak III-IV complex cysts due to tumor potential
- Radical nephrectomy may be considered if there is whole-kidney involvement or loss of function
- In polycystic kidney disease, symptoms, renal function, and blood pressure are managed together
Post-procedure
- 1-3 days of hospital stay depending on the procedure type; avoid heavy work and lifting for 4-6 weeks after discharge
- Bosniak II-F cysts are followed with contrast-enhanced imaging every 6-12 months
- First post-surgical follow-up at 2-4 weeks, then imaging at 3, 6, and 12 months
- Regular monitoring of kidney function with creatinine and urinalysis
- Urgent presentation if high fever, severe flank pain, or significant blood in the urine occurs
Risks
- Bleeding, leakage into or around the cyst, hematuria (blood in urine)
- Urinary tract infection or abscess formation in the procedure area
- Injury to adjacent organ or vessel (rare)
- Possibility of cyst refilling after sclerotherapy
- Need for additional treatment based on pathology results in complex cysts
FAQ
Should every kidney cyst be operated on?
No. The vast majority of asymptomatic Bosniak I-II simple cysts are followed only with intermittent imaging; treatment may not be needed.
Can a kidney cyst turn into cancer?
The risk of simple cysts becoming cancer is very low. What is important is that complex cysts such as Bosniak III-IV have a higher likelihood of being malignant; this is why classification is important.
Is draining the cyst fluid sufficient?
Drainage alone often results in cyst refilling. Therefore, sclerotherapy or laparoscopic removal of the cyst roof are preferred as more durable methods.
Will my kidney function deteriorate after the procedure?
With proper indication and appropriate technique, kidney function is largely preserved. There may be a small decline after partial nephrectomy, but most patients do not develop kidney failure.
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