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Figure 2: (a) A male, 51-year-old, with pulmonary metastasis after surgery for rectal cancer. Computed tomography scan showing a left lung metastasis before radiofrequency ablation. (b) A splinter hemorrhage occurred around the lesion during the needle insertion. (c) A patch of high-intensity shadow was seen on computed tomography around the lesion after radiofrequency ablation that was indistinguishable in appearance from postradiofrequency ablation ground-glass opacity. (d) Preoperative magnetic resonance imaging showing iso-signals on T1-weighted images. (e) Preoperative magnetic resonance imaging showing a long signal with nodules on T2-weighted images. (f) Preoperative magnetic resonance imaging showing a high signal intensity on diffusion-weighted imaging. (g) After radiofrequency ablation, magnetic resonance imaging showing short signals on T1- and T2-weighted images centrally, with patches of iso-signals on T1-weighted images and long signals on T2-weighted images in the surrounding areas. Puncture hemorrhage showed iso-signals on T1-weighted images and long signals on T2-weighted images. The peritumoral vascular exudative shadow was more narrow, with a possible local iso-signal on T1-weighted images. (h) The peritumoral vascular exudative shadow was more narrow, with a longer residual nodular signal on T2-weighted images. (i) The peritumoral vascular exudative shadow was more narrow, with a small residual nodular high signal on diffusion-weighted imaging. (j) Follow-up imaging 10 months after radiofrequency ablation showing an increase in the previously ablated lesions in the upper lobe of the left lung. (k) Follow-up imaging 10 months after radiofrequency ablation showing an increase in the previously ablated lesions in the upper lobe of the left lung. (l) Inhomogeneous enhancement on an enhanced scan

Figure 2: (a) A male, 51-year-old, with pulmonary metastasis after surgery for rectal cancer. Computed tomography scan showing a left lung metastasis before radiofrequency ablation. (b) A splinter hemorrhage occurred around the lesion during the needle insertion. (c) A patch of high-intensity shadow was seen on computed tomography around the lesion after radiofrequency ablation that was indistinguishable in appearance from postradiofrequency ablation ground-glass opacity. (d) Preoperative magnetic resonance imaging showing iso-signals on T1-weighted images. (e) Preoperative magnetic resonance imaging showing a long signal with nodules on T2-weighted images. (f) Preoperative magnetic resonance imaging showing a high signal intensity on diffusion-weighted imaging. (g) After radiofrequency ablation, magnetic resonance imaging showing short signals on T1- and T2-weighted images centrally, with patches of iso-signals on T1-weighted images and long signals on T2-weighted images in the surrounding areas. Puncture hemorrhage showed iso-signals on T1-weighted images and long signals on T2-weighted images. The peritumoral vascular exudative shadow was more narrow, with a possible local iso-signal on T1-weighted images. (h) The peritumoral vascular exudative shadow was more narrow, with a longer residual nodular signal on T2-weighted images. (i) The peritumoral vascular exudative shadow was more narrow, with a small residual nodular high signal on diffusion-weighted imaging. (j) Follow-up imaging 10 months after radiofrequency ablation showing an increase in the previously ablated lesions in the upper lobe of the left lung. (k) Follow-up imaging 10 months after radiofrequency ablation showing an increase in the previously ablated lesions in the upper lobe of the left lung. (l) Inhomogeneous enhancement on an enhanced scan