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Fibrous scar. Axial T2-weighted MR (a) and axial T1 FS contrast-enhanced (b) images, in a case of bilateral photodynamic therapy show a post-treatment pattern, with a small area of low signal intensity, without enhancement, corresponding to fibrous scar tissue (arrowhead). Low power (c, d) images from radical prostatectomy show a focus of sclerotic and hyaline necrosis on the left lobe suggesting a 7 × 5-mm therapy scar
