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10 Cards in this Set
- Front
- Back
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Density of masses
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Fat and mixed density masses are benign
Fat containing masses -oil cyst -lipoma -galactocele (fat-fluid level) Mixed density masses -hamartoma or fibroadenolipoma -lymph node Fibrograndular density - high, low, and isodense |
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Mass shape
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Round
Oval Lobular Irregular (suspicious) |
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Mass margin
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Circumscribed
-need to see >75% margin Microlobulated Obscured Indistinct (ill-defined) Spiculated |
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Management of masses
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A mass may be followed up (BIRADS 3) at baseline exam if:
Shape: round, oval, lobular Margin: circumscribed Mass - additional views Benign features? (contains fat or skin lesion) No - U/S Cyst or lymph nodes No - Round, oval, lobular? Circumbscribed? Yes - BIRADS 3 No - BIRADS 4/5 |
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Asymmetry
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Area of fibroglandular tissue that is visible on one view only.
80% represent superimposition of normal breast tissue. |
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Global asymmetry
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-Substantially greater volume of fibroglandular in one breast than in the contralateral breast.
-Occupies more that one quadrant. -No assoc. mass,calcifications,or architecture distortion. -almost always represents a normal variant |
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Mass vs. Focal asymmetry
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Both
-space occupying lesion, seen in 2 projections Mass -convex-outward contour -denser in center than at periphery Focal asymmetry -concave-outward contour -usually interspersed with fat -if no assoc. findings, <1% likelihood of malignancy |
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Focal asymmetry work-up
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-repeat the same view
-change beam obliquity slightly -change breast obliquity (roll view) -use spot-compression mag technique -targeted u/s if no mammographic, sonographic, or palpable abnormality: Baseline: BIRADS 3 Stability of at least 2-3 years: BIRADS 2. |
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Developing asymmetry
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Focal asymmetry that is new, larger, or denser than the prior study.
BIRADS 4 |
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Breast asymmetries
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With some exceptions:
Asymmetry BIRADS 1 Global asymmetry BIRADS 2 Focal asymmetry BIRADS 3 Developing asymmetry BIRADS 4 |
