Originalpublikation
American College of Radiology. ACR BI-RADS Atlas, 5th edition. Defines the standardised final assessment categories used here (0, 1, 2, 3, 4A–4C, 5, 6) and their associated likelihood of malignancy, for mammography, breast ultrasound, and breast MRI reporting.
Leitlinie
Category 0 means the assessment is incomplete and calls for additional imaging or comparison with prior studies, not a result in itself. Category 3 is generally followed with a short-interval (typically 6-month) imaging follow-up rather than biopsy. Categories 4A–4C and 5 are recommended for tissue diagnosis. Category 6 is used once malignancy is already confirmed by biopsy, to track a known cancer (e.g. during neoadjuvant therapy).