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Safety and feasibility of radiofrequency ablation for treatment of Bosniak IV renal cysts.

Menezes MR, Viana PC, Yamanari TR, Reis LO, Nahas W - Int Braz J Urol (2016 May-Jun)

Bottom Line: One patient had a single kidney.Mean volume reduction of complex cysts was 25% (range: 10-40%).No patients required retreatment with RFA and no immediate or late complications were observed.

View Article: PubMed Central - PubMed

Affiliation: Serviço de Intervenção Guiada de Radiologia e Imagem, Instituto do Câncer do Estado de São Paulo, Universidade de São Paulo, SP, Brasil.

ABSTRACT

Purpose: To describe our initial experience with radiofrequency ablation (RFA) of Bosniak IV renal cysts.

Materials and methods: From 2010 to 2014, 154 renal tumor cases were treated with percutaneous thermal ablation, of which 10 cases (6.4%) from nine patients were complex renal cysts and were treated with radiofrequency ablation.

Results: All complex cysts were classified as Bosniak IV (four women and five men; mean age: 63.6 yrs, range: 33-83 years). One patient had a single kidney. Lesion size ranged from 1.5 to 4.1cm (mean: 2.5cm) and biopsy was performed on four cysts immediately before the procedure, all of which were malignant (two clear cell and two papillary carcinoma). Mean volume reduction of complex cysts was 25% (range: 10-40%). No patients required retreatment with RFA and no immediate or late complications were observed. The follow-up of Bosniak IV cysts had a median of 27 months (interquartile range [IQR], 23 to 38) and no recurrence or significant loss of renal function were observed.

Conclusions: Mid-term follow-up of the cases in our database suggests that image-guided percutaneous RFA can treat Bosniak IV cysts with very low complication rates and satisfactorily maintain renal function.

No MeSH data available.


Related in: MedlinePlus

– (a-d) Tomographic images of radiofrequency ablation of Bosniak IV cystic lesion. CT without intravenous contrast (a) and post contrast (b) shows the hypoattenuation lesion in the left kidney and the exophytic cortical cyst in the upper third of the left kidney, containing thick internal septa that enhances after contrast. Non-enhanced CT (c) shows the positioning of the cluster needle in the axial plane. Enhanced-CT (d) immediately after the ablation shows the volumetric reduction of the lesion and the margins obtained after contrast injection, confirming proper treatment during the procedure.
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f01: – (a-d) Tomographic images of radiofrequency ablation of Bosniak IV cystic lesion. CT without intravenous contrast (a) and post contrast (b) shows the hypoattenuation lesion in the left kidney and the exophytic cortical cyst in the upper third of the left kidney, containing thick internal septa that enhances after contrast. Non-enhanced CT (c) shows the positioning of the cluster needle in the axial plane. Enhanced-CT (d) immediately after the ablation shows the volumetric reduction of the lesion and the margins obtained after contrast injection, confirming proper treatment during the procedure.

Mentions: A reduction in tumor size was observed in all Bosniak IV cyst cases immediately after the first RFA session (Figure-1). Mean volume reduction was 25% (range: 10–40%).


Safety and feasibility of radiofrequency ablation for treatment of Bosniak IV renal cysts.

Menezes MR, Viana PC, Yamanari TR, Reis LO, Nahas W - Int Braz J Urol (2016 May-Jun)

– (a-d) Tomographic images of radiofrequency ablation of Bosniak IV cystic lesion. CT without intravenous contrast (a) and post contrast (b) shows the hypoattenuation lesion in the left kidney and the exophytic cortical cyst in the upper third of the left kidney, containing thick internal septa that enhances after contrast. Non-enhanced CT (c) shows the positioning of the cluster needle in the axial plane. Enhanced-CT (d) immediately after the ablation shows the volumetric reduction of the lesion and the margins obtained after contrast injection, confirming proper treatment during the procedure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4920561&req=5

f01: – (a-d) Tomographic images of radiofrequency ablation of Bosniak IV cystic lesion. CT without intravenous contrast (a) and post contrast (b) shows the hypoattenuation lesion in the left kidney and the exophytic cortical cyst in the upper third of the left kidney, containing thick internal septa that enhances after contrast. Non-enhanced CT (c) shows the positioning of the cluster needle in the axial plane. Enhanced-CT (d) immediately after the ablation shows the volumetric reduction of the lesion and the margins obtained after contrast injection, confirming proper treatment during the procedure.
Mentions: A reduction in tumor size was observed in all Bosniak IV cyst cases immediately after the first RFA session (Figure-1). Mean volume reduction was 25% (range: 10–40%).

Bottom Line: One patient had a single kidney.Mean volume reduction of complex cysts was 25% (range: 10-40%).No patients required retreatment with RFA and no immediate or late complications were observed.

View Article: PubMed Central - PubMed

Affiliation: Serviço de Intervenção Guiada de Radiologia e Imagem, Instituto do Câncer do Estado de São Paulo, Universidade de São Paulo, SP, Brasil.

ABSTRACT

Purpose: To describe our initial experience with radiofrequency ablation (RFA) of Bosniak IV renal cysts.

Materials and methods: From 2010 to 2014, 154 renal tumor cases were treated with percutaneous thermal ablation, of which 10 cases (6.4%) from nine patients were complex renal cysts and were treated with radiofrequency ablation.

Results: All complex cysts were classified as Bosniak IV (four women and five men; mean age: 63.6 yrs, range: 33-83 years). One patient had a single kidney. Lesion size ranged from 1.5 to 4.1cm (mean: 2.5cm) and biopsy was performed on four cysts immediately before the procedure, all of which were malignant (two clear cell and two papillary carcinoma). Mean volume reduction of complex cysts was 25% (range: 10-40%). No patients required retreatment with RFA and no immediate or late complications were observed. The follow-up of Bosniak IV cysts had a median of 27 months (interquartile range [IQR], 23 to 38) and no recurrence or significant loss of renal function were observed.

Conclusions: Mid-term follow-up of the cases in our database suggests that image-guided percutaneous RFA can treat Bosniak IV cysts with very low complication rates and satisfactorily maintain renal function.

No MeSH data available.


Related in: MedlinePlus