A Mathematical Method to Calculate Tumor Contact Surface Area: An Effective Parameter to Predict Renal Function after Partial Nephrectomy

Hsieh, Po Fan; Hsieh, Po-Fan; Huang, Chi‐Ping; Wu, Hsi Chin; Yang, Che Rei; Chen, Guang Heng; Chang, Chao Hsiang

doi:10.1016/j.juro.2016.01.092

Cited by 33 publications

(45 citation statements)

References 23 publications

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“…Fourth, parenchymal volume and CSA were measured by Mimics 20.0 and 3-matic 12.0, which were not used in previous reports related to CSA. [5][6][7] However, volumetric study 15 and evaluation of the surface area 16 were previously carried out by this software, which might support our method. In addition, the correlation coefficient between renal parenchymal volume reduction and global renal functional decline was 0.3667 (P = 0.001, figure not shown), which might also support the precision of volumetric study.…”

Section: Discussionmentioning

confidence: 63%

“…To minimize this limitation, patients with solitary kidney were excluded. Fourth, parenchymal volume and CSA were measured by Mimics 20.0 and 3‐matic 12.0, which were not used in previous reports related to CSA . However, volumetric study and evaluation of the surface area were previously carried out by this software, which might support our method.…”

Section: Discussionmentioning

confidence: 90%

“…15 Regarding CSA calculation, a previous study calculated CSA using an equation incorporating the tumor radius and depth of tumor invasion into the renal parenchyma. 6,7 In the present study, the CSA was outlined by free-hand drawing, and automatically calculated ( Fig. 3c; orange) using Mimics.…”

Section: Discussionmentioning

confidence: 99%

“…The CSA between the tumor and the parenchyma is a proposed predictor of postop renal function after PN, and several studies have reported its validity . Leslie et al .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] The CSA between the tumor and the parenchyma is a proposed predictor of postop renal function after PN, and several studies have reported its validity. [5][6][7][8] Leslie et al analyzed the correlation between tumor CSA and perioperative outcomes in patients undergoing PN, and demonstrated that CSA independently predicted the operative time, complications, hospital stay and renal functional outcomes. 8 However, several surgical approaches (such as open or laparoscopic) and resection techniques (such as enucleation or standard PN) were used in these studies.…”

Section: Introductionmentioning

confidence: 99%

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Association between tumor contact surface area and parenchymal volume change in robot‐assisted laparoscopic partial nephrectomy carried out using the enucleation technique

et al. 2019

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Objective To evaluate the change in the operated parenchymal volume during robot‐assisted partial nephrectomy limited to the enucleation technique, and to analyze the predictors of decrease in operated parenchymal volume, including the tumor contact surface area. Methods The study included 135 patients who underwent robot‐assisted partial nephrectomy for T1 renal tumors using the enucleation technique. Measurements of the parenchymal volume, tumor volume and contact surface area were obtained in the venous phase on enhanced computed tomography. All measurements, including volumetric and renal function analysis, were carried out <2 months before and 6 months after surgery. Results The mean age of included participants was 56 years, and the mean tumor size was 33 mm. The mean tumor volume was 26 cc, and the mean contact surface area was 22 cm2. In the complete cohort, the mean preoperative and postoperative normal parenchymal volumes of the operated kidney were 158 and 141 cc, respectively. The mean change in parenchymal volume of the operated kidney was −10%. In contrast, the mean change in global estimated glomerular filtration was just −4.0%. Univariate analysis showed that the RENAL nephrometry score, contact surface area, tumor volume and warm ischemia time were associated with the change in the operated kidney parenchymal volume. However, in the multivariate analysis, a large contact surface area was the only independent predictor of decreased operated parenchymal volume <10 cm3. Conclusion Contact surface area is a strong predictor of the decrease in the parenchymal volume in the operated kidney during robot‐assisted partial nephrectomy carried out using the enucleation technique for T1 renal tumors.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

“…The CSA between the tumor and the parenchyma is a proposed predictor of postop renal function after PN, and several studies have reported its validity . Leslie et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Association between tumor contact surface area and parenchymal volume change in robot‐assisted laparoscopic partial nephrectomy carried out using the enucleation technique

et al. 2019

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Contact surface area and its association with outcomes in robotic‐assisted partial nephrectomy

Kahn

Shumate

Galler

et al. 2020

Robotics Computer Surgery

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Background: Renal tumor scoring systems, such as the contact surface area value, aim to assist in predicting outcomes following robotic-assisted partial nephrectomy.The aim of this study is to identify associations between specific postoperative outcomes and the contact surface area of renal masses. Methods:We analyzed 332 consecutive robotic-assisted partial nephrectomies and calculated contact surface area for renal tumors with the contact surface area formula (CSA = 2πrd), where π ≈ 3.14, r = greatest tumor radius (cm), and d = greatest tumor depth (cm).Results: Higher contact surface area was associated with longer warm ischemia time (P < .001), higher estimated blood loss (P < .001), and longer length of hospital stay (LOS) (P < .001). Higher contact surface area was significantly associated with decreased renal function at 1 day, 1 month, and 6 months following robotic-assisted partial nephrectomy. Conclusions:Contact surface area is associated with certain outcomes following robotic-assisted partial nephrectomy and may be a useful predictive tool. K E Y W O R D Scontact-surface area, outcomes, renal lesion, renal nephrometry scores, robotic-assisted partial nephrectomy

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Open Partial Nephrectomy

Ather¹

2017

The Management of Small Renal Masses

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A Mathematical Method to Calculate Tumor Contact Surface Area: An Effective Parameter to Predict Renal Function after Partial Nephrectomy

Abstract: Using this simple mathematical method, contact surface area was associated with surgical outcomes. Compared to R.E.N.A.L. score, contact surface area was a better predictor of functional change after partial nephrectomy.

Cited by 33 publications

References 23 publications

Association between tumor contact surface area and parenchymal volume change in robot‐assisted laparoscopic partial nephrectomy carried out using the enucleation technique

Association between tumor contact surface area and parenchymal volume change in robot‐assisted laparoscopic partial nephrectomy carried out using the enucleation technique

Contact surface area and its association with outcomes in robotic‐assisted partial nephrectomy

Open Partial Nephrectomy

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