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Published on: March 30, 2015
Preoperative Computed Tomography Assessment for Perinephric Fat Invasion: Comparison With Pathological Staging
Jaime Landman1, Jae Young Park, Chenhui Zhao
1From the Departments of *Urology and †Radiology, University of California, Irvine, Orange, CA; ‡Department of Urology, Korea University College of Medicine, Seoul, Republic of Korea; §Department of Urology, Ruijin Hospital Luwan Branch Affiliated to Shanghai JiaoTong University School of Medicine, Shanghai, People's Republic of China; and ∥Department of Obstetrics and Gynecology, University of California, Davis, Sacramento, CA.
Computed tomography (CT) is not reliable for diagnosing perinephric fat invasion in renal cell carcinoma. However, perinephric soft-tissue stranding is a significant predictor, especially for smaller tumors.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Renal cell carcinoma (RCC) is a common kidney cancer.
- Accurate staging of RCC, including assessment of perinephric fat (PNF) invasion, is crucial for treatment planning and prognosis.
- Computed tomography (CT) is a primary imaging modality used in RCC evaluation.
Purpose of the Study:
- To evaluate the diagnostic accuracy of preoperative CT imaging in detecting perinephric fat (PNF) invasion in patients with renal cell carcinoma (RCC).
- To identify specific CT criteria that reliably predict PNF invasion.
- To assess the impact of tumor size on the accuracy of CT findings.
Main Methods:
- Retrospective review of CT images and medical records from 161 patients with pT1-pT3a RCC.
- Analysis of CT criteria including soft-tissue stranding, vascularity, PNF density, tumor margin, and soft-tissue nodules.
- Logistic regression analysis to determine the predictive value of CT findings for PNF invasion, stratified by tumor size.
Main Results:
- Overall accuracy for predicting PNF invasion varied among CT criteria, with contrast-enhancing soft-tissue nodules (87%) and tumor margin (80%) showing higher accuracy.
- Perinephric soft-tissue stranding demonstrated high sensitivity but low specificity.
- For tumors ≤4 cm, perinephric soft-tissue stranding showed 100% sensitivity and 70% specificity, while tumor margin showed 100% sensitivity and 98% specificity.
- Logistic regression identified perinephric soft-tissue stranding as the sole significant predictor of PNF invasion.
Conclusions:
- Computed tomography (CT) alone may not reliably predict perinephric fat (PNF) invasion in all renal cell carcinoma (RCC) cases.
- Perinephric soft-tissue stranding is a significant CT finding for assessing PNF invasion, particularly in smaller tumors (≤4 cm), offering high sensitivity and specificity.
- Further refinement of CT interpretation or integration with other diagnostic methods may be needed for comprehensive PNF invasion assessment.
