A 45-year-old woman has a screening mammogram showing a 9 mm oval mass with circumscribed margins and 'egg-shell' rim calcification. No prior imaging is available. What is the most appropriate BI-RADS assessment?
- A BI-RADS 3, probably benign
- B BI-RADS 2, benign ✓
- C BI-RADS 4A, low suspicion for malignancy
- D BI-RADS 0, incomplete
Correct answer: B. BI-RADS 2, benign
Explanation
An egg-shell (peripheral rim) calcification surrounding a mass is characteristic of a benign entity, most commonly a cyst with calcified wall or fat necrosis. This is a classic benign finding warranting BI-RADS 2. BI-RADS 3 is for non-calcified solid masses with oval shape and circumscribed margins. The presence of this specific benign calcification pattern upgrades the assessment to definitively benign rather than probably benign.
Reference: ACR BI-RADS Atlas, 5th ed.
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Written and medically reviewed by the StethoPrep medical team.