PMC6159159_01
Incident round screening mammograms of the left breast. White arrows indicate a new 9-mm well-defined density in the outer half of the left breast.
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fig1
Incident round screening mammograms demonstrated a new 9-mm indeterminate density in the outer half of the left breast (Figure 1).
Breast ultrasound demonstrates a 9-mm predominantly well-defined hypoechoic mass in the outer half of the left breast corresponding to the mammographic abnormality.
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fig2
Ultrasound showed a 9-mm predominantly well-defined hypoechoic mass corresponding to the mammographic abnormality (Figure 2).
14-gauge core needle biopsy histopathology specimens demonstrate an accumulation of large histiocytes with emperipolesis (engulfed lymphocytes within their cytoplasm).
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fig3
These appearances were reported as in keeping with Rosai-Dorfman disease (RDD; Figure 3).