Renal Sinus Fat Invasion and Tumoral Thrombosis of the Inferior Vena Cava-Renal Vein: Only Confined to Renal Cell Carcinoma

Figure 1

(a–d) E-AML both contains fatty and nonadipose components. T1W axial in-phase (a) and out-phase images (b) reveal mass lesion involving renal sinus and subcapsular region. No apparent fat is seen in some portion (thin arrows). However, due to pure fat content of subcapsular tumor component, no signal reduction is seen in dual echo imaging (thick arrow). TruFISP coronal image (c) shows subcapsular extension and maximum diameter. Axial T2W fat-saturated image (d) shows solid infiltrative renal mass with renal sinus and pelvicalyceal extension; note that pure fatty portion of subcapsular component demonstrates signal reduction (arrowheads).

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