• Sensitivity of magnetic resonance (MR) techniques in detecting histopathologically-identified multifocal and multicentric lesions [ Designated as safety issue: No ]
  

• Closeness of agreement between MR techniques and histopathology in localizing satellite lesions relative to the index tumor [ Designated as safety issue: No ]
  
• Assessment of distribution of satellite lesions in relation to index tumor [ Designated as safety issue: No ]
  
• Correlation between histopathological characteristics and signal changes on multifunctional MR [ Designated as safety issue: No ]
  

OBJECTIVES:

• To determine the accuracy of multifunctional magnetic resonance (MR) in detecting, localizing, and characterizing satellite lesions in relation to an index breast tumor in order to improve definition of clinical target volume after local excision.

OUTLINE: Patients receive an injection of gadolinium chelate and undergo multifunctional magnetic resonance (MR) imaging, including dynamic contrast-enhanced MR, hydrogen-MR spectroscopy, and diffusion-weighted MRI, of the ipsilateral breast within 4 weeks before surgery. Patients undergo a mastectomy as planned. The resected specimen is photographed, and a histopathological analysis is performed consisting of the size and grade (if pre-invasive or invasive disease) of each satellite lesion, classification of benign satellite lesions, dimensions of each lesion, distance from the edge of the index tumor to the center of each satellite lesion, and the distance from the center of the surface of the nipple to the center of each lesion.