Tabar 5-tier grading system

Last revised by Henry Knipe on 20 Oct 2015

The Tabar 5-tier grading system is used to classify mammographic lesions. This should not be confused with the Tabar classification of parenchymal patterns in breast imaging. It is a separate but translatable system to the BI-RADS classification system (please note that Tabar grade 3 ≠ BI-RADS 3). 


  • grade 1: normal
  • grade 2: benign
  • grade 3: equivocal/indeterminate
  • grade 4: suspicious for malignancy
  • grade 5: mammographically malignant

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