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5 tier ACR system

The 5 tier ACR system was an older system for classification of radiologic breast findings. 

  • 5 : malignant
  • 4 : probably malignant : biopsy should be considered
  • 3 : probably benign : initial short term follow up recommended 
  • 2 : benign
  • 1 : normal
  • 0 : need additional views

It has been replaced by the new 6 tier BIRADS classification system.

See also

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