PMC3504196_01
(a) US showing the highly echogenic appearance of renal sinus with fat tissue that covers most of renal surface. (b) Longitudinal scan of the transplanted kidney showing a discrete degree of hydronephrosis, more pronounced in the upper calyces.
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fig1
The US confirmed the alteration of renal structure due to the presence of a conspicuous nonvascularized mass (10.4 x 4.1 cm) that completely wrapped the kidney around, but had the characteristics of fat tissue, with a concomitant hydronephrosis (Figures 1(a) and 1(b)).
(a) US and (b) CT scan (with contrast medium) performed after the resolution of acute renal impairment, showing the persistence of a mild dilatation of upper calyces and the impregnation with contrast media of pelvicalyceal structures. The entity of perirenal fat is not modified.
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fig2
After stabilisation of renal function, an US and a new CT (with contrast medium) were performed on December 2010, that showed the persistence of a slight dilatation in the upper calyces (localized hydrocalicosis) and the normal diameter of proximal ureter (Figures 2(a) and 2(b)).