Figure 18. Parenchymal cyst in an 18-year-old man with a palpable subareolar breast mass. US image shows an oval, circumscribed, anechoic mass with an imperceptible wall (arrow), posterior acoustic enhancement (arrowhead), and no internal vascularity (not shown) in the subareolar left breast. There is no overlying tract noted through the skin. Aspiration was performed,yielding 4 mL of brownish fluid and complete resolution of the cyst. Cytologic results showed acute and chronic inflammation and macrophages, without evidence of malignancy. (Case courtesy of Hemali Desai, MD.)
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