Fig. 3
From: Imaging spectrum of renal oncocytomas: a pictorial review with pathologic correlation
A 72-year-old woman with a right renal oncocytoma demonstrating persistent enhancement in the nephrographic phase. a The arterial phase of the axial CE-CT shows a heterogeneously enhancing mass (arrow). b The nephrographic phase shows avid enhancement of the mass (arrow). c The delayed phase shows the mass to washout to homogeneously low attenuation (arrow). d (Low magnification) Oncocytoma, equal amounts of tumour cells (T) and stoma (S). e (High magnification) Oncocytoma, organoid pattern with classic polygonal tumour cells with abundant granular eosinophilic cytoplasm, uniformly round nuclei with prominent nucleoli. Abundant small blood vessels are interposed within the stroma (arrows)