Abstract
Objective
To identify adhesive renal venous tumor thrombus (RVTT) of renal cell carcinoma (RCC) by contrast-enhancement CT (CECT).
Materials and methods
Our retrospective study included 53 patients who underwent preoperative CECT and pathologically confirmed RCC combined with RVTT. They were divided into two groups based on the intra-operative findings of RVTT adhesion to the venous wall, with 26 cases in the adhesive RVTT group (ARVTT) and 27 cases in the non-adhesive group (NRVTT). The location, maximum diameter (MD) and CT values of tumors, the maximum length (ML) and width (MW) of RVTT, and length of inferior vena cava tumor thrombus were compared between the two groups. The presence of renal venous wall involvement, renal venous wall inflammation, and enlarged retroperitoneal lymph node was compared between the two groups. A receiver operating characteristic curve was used to analyze the diagnostic performance.
Results
The MD of RCC and the ML and MW of the RVTT were all larger in the ARVTT group than in the NRVTT group (p = 0.042, p < 0.001, and p = 0.002). The proportion of renal vein wall involvement and renal vein wall inflammation were higher in the ARVTT group than in NRVTT groups (both p < 0.001). The multivariable model including ML and vascular wall inflammation to predict ARVTT could achieve the best diagnostic performance with the area under the curve, sensitivity, specificity, and accuracy of 0.91, 88.5%, 96.3%, and 92.5%, respectively.
Conclusion
The multivariable model acquired by CECT images could be used to predict RVTT adhesion.
Clinical relevance statement
For RCC patients with tumor thrombus, contrast-enhanced CT could noninvasively predict the adhesion of tumor thrombus, thus predicting the difficulty of surgery and contributing to the selection of an appropriate treatment plan.
Key Points
• The length and width of the tumor thrombus could be used to predict its adhesion to the vessel wall.
• Adhesion of the tumor thrombus can be reflected by inflammation of the renal vein wall.
• The multivariable model from CECT can well predict whether the tumor thrombus adhered to the vein wall.
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Abbreviations
- ARVTT:
-
Adhesive renal venous tumor thrombus
- AUC:
-
Area under the curve
- CECT:
-
Contrast-enhancement computed tomography
- IVC:
-
Inferior vena cava
- L-VCT:
-
Length of the tumor thrombus in the inferior vena cava
- MD:
-
Maximum diameter
- ML:
-
Maximum length
- MW:
-
Maximum width
- NRVTT:
-
Non-adhesive renal venous tumor thrombus
- RCC:
-
Renal cell carcinoma
- ROC:
-
Receiver operating characteristic
- RVTT:
-
Renal venous tumor thrombus
- VCT:
-
Tumor thrombus in the inferior vena cava
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Funding
This work was supported by the National High Level Hospital Clinical Research Funding (grant no.2022-PUMCH-A-033), the CAMS Innovation Fund for Medical Sciences (grant no.2022-I2M-C&T-B-019), the National High Level Hospital Clinical Research Funding (grant no.2022-PUMCH-B-069), the National High Level Hospital Clinical Research Funding (grant no.2022-PUMCH-A-035), the National Natural Science Foundation of China (grant no.81901742), the National Natural Science Foundation of China (grant no. 91859119), and the 2021 Key clinical Specialty Program of Beijing, Beijing Municipal Key Clinical.
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The scientific guarantor of this publication is Hao Sun.
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Zhang, X., Zhang, J., Zhang, G. et al. The feasibility of contrast-enhanced CT to identify the adhesive renal venous tumor thrombus of renal cell carcinoma. Eur Radiol 33, 7429–7437 (2023). https://doi.org/10.1007/s00330-023-09776-w
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DOI: https://doi.org/10.1007/s00330-023-09776-w