Renal cyst sclerotherapy is a minimally invasive procedure performed to treat symptomatic simple renal cysts (i.e. Bosniak I) and is one of the primary methods to treat renal cysts along with surgical cyst de-roofing 1.
Note: This article is intended to outline some general principles of the procedure. The specifics will vary depending on the radiologist's and referrer's preference, institutional protocols, patient factors (e.g. allergy), and time constraints.
Indications
It is indicated in all symptomatic simple (Bosniak 1) renal cysts with:
pain or discomfort
urinary tract obstruction
Pre-procedure assessment
exclude and correct coagulopathy
inquire for allergies
Patient preparation
monitoring of pulse and blood pressure
anxiolytics and analgesics
prone position in general
area sterilization
Material preparation
Generally, the material prepared consists of:
5F centesis catheter
0.035 glidewire
8.5F drainage catheter and 8F dilator (optional)
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various sclerosing agents are described including
absolute ethanol (99.5%) 1
n-butyl cyanoacrylate 2
20% hypertonic saline 3
acetic acid4
ethanolamine oleate5
Procedure
Local anesthesia
e.g. lidocaine 2%
Ultrasound-guided or CT-guided puncture of the renal cyst
puncture of the cyst using the 5F centesis catheter
secure the position with the glidewire
exchange the 5F sheath catheter with an 8.5F drainage catheter; tract dilation with an 8F dilator is optional
aspiration of the cyst content
Cyst opacification
This step is primordial to verify the absence of communication between the cyst, pelvicalyceal system and/or vessels
under fluoroscopy/CT, fill the residual cystic cavity with a mixture of saline and contrast medium (same volume of aspirated cystic fluid)
remove the injected mixture of saline and contrast
Sclerotherapy
The sclerosing agent, volume and retention duration are highly variable, depending on institutions and operators.
inject through the drainage catheter, 25-50%1,6,7 of the aspirated volume with 99.5% ethanol (maximum of 100 mL 1)
to expose all of the cyst surfaces to the sclerosing agent, the patient should be placed in supine, lateral decubitus, prone positions at 10-15 minutes intervals for a total of 40-120 min of retention 1
aspirate the ethanol and remove the drainage catheter
Complications
sclerosis of the pelvicaleceal sytem if there is communication with the renal cyst
brain or visceral injury if there is vessel-cyst communication