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Abstract #1572

Renal Masses Measuring Under 2 Cm: What Is the Utility of MRI Features in Distinguishing Benign and Malignant Cases?

Mohammed Shaikh1, Natasha E. Wehrli1, Jonathan Melamed2, Samir S. Taneja3, Andrew B. Rosenkrantz1

1Radiology, NYU Langone Medical Center, New York, United States; 2Pathology, NYU Langone Medical Center, New York, United States; 3Urologic Oncology, NYU Langone Medical Center, New York, United States

We identified renal masses measuring up to 2 cm that underwent biopsy or resection following MRI. 93 masses in 87 patients were identified. 73% were malignant; 27% were benign. Two radiologists independently assessed each mass for microscopic lipid, hemorrhage, T2-hyperintensity, T2-homogeneity, cystic/necrotic areas, hypervacularity, homogeneous enhancement, circumscribed margins, and exophytic location. No MRI feature showed a significant difference in frequency between benign and malignant masses for either reader. In addition, there was no significant difference in age, gender, or lesion size, between benign and malignant masses. Further analysis will explore role of additional clinical features in this differentiation.