5-tier ACR system of radiologic breast findings (historical)

Last revised by Henry Knipe on 17 Feb 2024

The 5-tier ACR system was a previously used system for the classification of radiologic breast findings, proposed by the American College of Radiology (ACR) ref. It is no longer in use having been superseded by the 6-tier BI-RADS classification system first published in 1992 1.

Classification

Interestingly, despite its name, it was a 6-tier system ref:

  • 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

See also

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