Successful conservative management of a colorenal fistula complicating percutaneous cryoablation of renal tumors: a case report
© Morgan et al.; licensee BioMed Central Ltd. 2012
Received: 25 February 2012
Accepted: 12 September 2012
Published: 26 October 2012
Colorenal fistula is a rare phenomenon and may complicate percutaneous cryoablation of renal cell carcinoma. Treatment remains controversial.
A 62-year-old Caucasian man presented with pneumaturia and left flank pain six weeks following ultrasound-guided percutaneous cryoablation of two recurrent lesions in the left kidney 14 years after partial left nephrectomy for a left renal cell carcinoma. A computed tomography scan eight weeks after cryoablation revealed a cryoablated mass with adjacent stranding and adherent descending colon as well as bubbles of gas in the area of stranding, the left collecting system, and the bladder. These features were consistent with a colorenal fistula at the site of previous ablation. Successful resolution of the fistula, both clinical and radiological, was achieved following a complete conservative non-interventional out-patient approach. No ureteric stent or surgical intervention was employed.
In the absence of severe symptoms or sepsis, complete conservative management of a colorenal fistula complicating percutaneous cryoablation of renal tumors should be considered prior to interventional stenting or resectional surgery.
KeywordsColorenal fistula Cryoablation Renal cell carcinoma
Colorenal fistula complicating percutaneous cryoablation of renal cell carcinoma has been reported in the literature on two previous occasions [1, 2]. However, the most appropriate method of treatment is unclear. We present a patient with a colorenal fistula complicating cryoablation of renal tumors who had his fistula successfully treated with a complete conservative approach. No ureteric stent or surgical intervention was employed.
A 62-year-old Caucasian man presented with pneumaturia and left flank pain six weeks after ultrasound-guided percutaneous cryoablation of two lesions in the anterior aspect of the mid pole and posterior upper pole of the left kidney 14 years after previous partial left nephrectomy for a left renal cell carcinoma. Our patient had an extensive medical history related to Von Hippel-Lindau disease, including previous right adrenalectomy for a phaeochromocytoma, right partial nephrectomy for renal cell carcinoma, posterior fossa surgery for a cerebellar hemangioblastoma, left partial nephrectomy for a renal cell carcinoma, and multiple pulmonary emboli resulting in the insertion of an inferior vena cava filter.
The incidence of renal cell carcinoma is increasing, and there has been a shift toward utilization of nephron-sparing surgery when feasible. Renal cryoablation is associated with higher local retreatment rates in comparison with radical or partial nephrectomy, although intermediate-term oncological outcomes suggest that disease-specific survival approaches that of resectional surgery .
Despite this change in treatment approach, colorenal fistula complicating renal cryoablation has been reported on only two occasions [1, 2]. During the procedure of cryoablation, the colon is typically hydrodissected to reduce the risk of colonic injury. Therefore, it is possible to inadvertently puncture the colon with an applicator or extension of the ablation zone. Perforation may be followed by fistula or abscess formation or both .
Diagnosis of colorenal fistula should be based on clinical and radiological evidence. In this case, a CT scan was diagnostic . There are no available data to suggest the optimal treatment option. Wysocki et al. reported successful surgical treatment involving nephrectomy, colectomy, and end colostomy. Vanderbrink et al. reported successful symptom resolution after placement of an internal ureteric stent. Our experience suggests that, in the absence of symptoms indicating that surgery may be required, such as intestinal obstruction, bleeding, sepsis, or renal failure , symptoms of a colorenal fistula may resolve spontaneously with complete conservative non-interventional out-patient management. No ureteric stent or surgical intervention was necessary.
In this case, careful follow-up and close communication with our patient allowed successful conservative treatment. Our patient had no recurrence of his colorenal fistula over a follow-up period of 18 months. This avoided the need for interventional or extensive resectional procedures, which would have been potentially high risk in a patient with significant co-morbidities.
Colorenal fistula complicating percutaneous cryoablation of renal tumors can be successfully treated with non-interventional conservative management.
Written informed consent was obtained from the patient for publication of this case report and the accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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