Figure 2.

Axial in-phase (a) and out-of-phase (b) gradient-echo T₁ weighted images of the abdomen demonstrate T₁ hyperintensity of the tissue expanding the left renal sinus (RS). Although the T₁ hyperintensity by itself is non-specific, the peripheral etching along its margin with adjacent renal parenchyma indicates the fatty nature of this tissue. The dilated renal calyces peripherally are T₁ hypointense (*), consistent with their fluid content.