AI Summary & Key Takeaways
AI InsightIn the excretory phase of dynamic enhanced images, oncocytomas have higher signal intensity ratio than chro-mophobe RCC and high wash-in values strongly imply a diagnosis of renal oncocytoma.
📌 3 Key Takeaways
Özet
PURPOSE We aimed to evaluate magnetic resonance imaging (MRI) features, including signal intensities, enhancement patterns and T2 signal intensity ratios to differentiate oncocytoma from chromo-phobe renal cell carcinoma (RCC).METHODSThis retrospective study included 17 patients with oncocytoma and 33 patients with chromo-phobe RCC who underwent dynamic MRI. Two radiologists independently reviewed images blinded to pathology. Morphologic characteristics, T1 and T2 signal intensities were reviewed. T2 signal intensities, wash-in, wash-out values, T2 signal intensity ratios were calculated. Sensitivity and specificity analyses were performed. RESULTSMean ages of patients with oncocytoma and chromophobe RCC were 61.0±11.6 and 58.5±14.0 years, respectively. Mean tumor size was 60.6±47.3 mm for oncocytoma, 61.7±45.9 mm for chro-mophobe RCC. Qualitative imaging findings in conventional MRI have no distinctive feature in discrimination of two tumors. Regarding signal intensity ratios, oncocytomas were higher than chromophobe RCCs. Renal oncocytomas showed higher signal intensity ratios and wash-in val-ues than chromophobe RCCs in all phases. Fast spin-echo T2 signal intensities were higher in oncocytomas than chromophobe RCCs. CONCLUSIONSignal intensity ratios, fast spin-echo T2 signal intensities and wash-in values constitute diag-nostic parameters for discriminating between oncoytomas and chromophobes. In the excretory phase of dynamic enhanced images, oncocytomas have higher signal intensity ratio than chro-mophobe RCC and high wash-in values strongly imply a diagnosis of renal oncocytoma.