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 It is no longer in use having been superseded by the 6-tier BI-RADS classification system first published in 1992 1.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
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