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Figure 4b. Transverse high-field-strength MR images of the ablation zone (arrows) after the first of two debulking thermal ablation procedures performed to palliate patient with a large central RCC of the right kidney and global renal function impairment. (a) On breath-hold T2-weighted half-Fourier RARE image (800/42, one signal acquired, 205 x 256 matrix, 30 x 40-cm field of view), the ablation zone is hypointense. (b) On unenhanced two-dimensional T1-weighted in-phase GRE image (fast low-angle shot sequence, 222/2.6, 70° flip angle, 205 x 256 matrix, 30 x 40- cm field of view), the ablation zone is hyperintense. (c) On gadolinium-enhanced two-dimensional T1-weighted GRE image (fast low-angle shot sequence, 222/2.6, 70° flip angle, 205 x 256 matrix, 30 x 40-cm field of view), the ablation zone has no enhancement. The area of residual tumor (white arrowheads) can be readily identified as hyperintense tissue capping the anteromedial aspect of the ablation zone in a, as an isointense area in b, and as a markedly enhancing area in c. Note the left-sided nephrostomy tube (black arrowheads in a and c).
