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Fig. 1A —66-year-old woman with recurrent sacrococcygeal chordomas. A-C are T2-weighted transverse images. Follow-up images D-F are T1-weighted fat-saturated contrast-enhanced with high-field-strength MRI. For radiofrequency treatment, patient was placed in prone position on left side. (These images have been rotated to resemble regular supine scanning position.) Before procedure, location of paraanal sacrococcygeal chordoma was determined (arrow, A). Using multiplanar reconstruction in MRI, radiofrequency applicator (arrow, B) could be exactly placed in center of tumor (only transverse section is shown). After treatment, hyperintense signal of tumor is replaced by hypointense coagulated material (arrow, C).