Fig. 4
From: Imaging spectrum of renal oncocytomas: a pictorial review with pathologic correlation
A 56-year-old man with right renal oncocytoma demonstrating hypovascularity and gradual enhancement. a Coronal reformatted image of the corticomedullary phase of a CE-CT shows a low attenuation mass in the lower right renal pole (arrow). b The nephrographic phase demonstrates patchy peripheral enhancement (small arrows). c The delayed phase shows gradual enhancement with a small residual area of low attenuation (arrow). d (Low magnification) Oncocytoma, a peripheral rim of tumour cells (T) surrounds abundant oedematous stroma (S)