3-D MRI guided breast conserving surgery

610 Background: In breast cancer patients, accurate diagnosis of ductal spreading is of great importanace for deciding sugical procedure. The role of imaging diagnosis using 3D-MRI in deciding of ductal spreading was assessed histologically and efficacy of 3D-MRI guided surgery was evaluated. Methods: Preoperative 3D-MRI was underwent 374 cases of breast cancer patients. Images were obtained 371 cases (99%). These patients could be divided into four groups according to 3D-MRI images: pattern 1) localized type, 2) widely enhanced type A (enhanced area: less than Quadrant) and 3) widely enhanced type B (enhanced area: more than Quadrant) and 4) multifocal type. Diagnosis of ductal spreading was confirmed histologically and relation between 3D-MRI patterns and ductal spreading were assessed retrospectively. Local failure of 3D-MRI guided surgery was assessed by 3D-MRI image patterns Results: The rate of histological confirmed ductal spreading were seen in 59% (125/212cases), 86% (49/57 cases) and 83% (19/23c...