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Figure 1


Fig. 1A —62-year-old man with presacral abscess secondary to anastomotic leakage after resection of invasive rectal adenocarcinoma who was referred for abscess drainage. Preprocedural sagittal (A) and axial (B) true fast imaging with steady-state free precession (true-FISP) images (TR/TE, 4.35/2.18; field of view, 250 x 250 mm, matrix, 192 x 192; slice thickness, 5 mm; flip angle, 60°; number of signals averaged, 3) show typical setup for triorthogonal image plane guidance. Desired trajectory is planned so that fluid component of presacral abscess (arrowheads) cavity resides along sagittal (1), oblique coronal (2), and axial (3) planes of guidance. Trajectory can subsequently be modified to any combination of three planes during needle navigation in time-efficient manner.