Is multidetector CT-scan able to detect T3a renal tumor before surgery?

Area of Science:

• Radiology
• Oncology
• Urology

Background:

• Accurate staging of renal cell carcinoma (RCC) is crucial for treatment planning.
• Multidetector Computed Tomography (MDCT) is a key imaging modality for RCC staging.
• Distinguishing between localized and locally advanced RCC (T3a) impacts patient management.

Purpose of the Study:

• To assess the diagnostic accuracy of MDCT in predicting T3a renal cell carcinoma (RCC).
• To evaluate specific MDCT findings related to local invasion, including peritumoral fat, sinus fat, and venous invasion.
• To determine the influence of perinephric soft-tissue stranding on MDCT interpretation.

Main Methods:

• Preoperative MDCT scans of 100 pathologically confirmed RCC cases were reviewed by two radiologists.
• Radiologists focused on identifying peritumoral fat, sinus fat, and venous invasion for clinical T3a (cT3a) staging.
• Tumor margins, neovessels, and perinephric soft-tissue stranding were also assessed.

Main Results:

• MDCT demonstrated high sensitivity (86%) and specificity (88%) for sinus fat and high sensitivity (86%) and specificity (97%) for venous invasion.
• Overall T3a prediction accuracy was moderate (72% sensitivity, 70% specificity; κ=0.38).
• Perinephric fat evaluation was challenging, with 16% of pT3 tumors under-staged and 27% of confined tumors over-staged, often associated with perinephric soft-tissue stranding.

Conclusions:

• MDCT is effective in detecting sinus fat and venous invasion in RCC, aiding in staging.
• Accurate assessment of perinephric fat invasion by MDCT remains difficult, limiting T3a staging precision.
• Further refinement of MDCT interpretation or complementary imaging may be needed for precise T3a RCC staging.