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Chest‐wall abscess presenting as a breast lump

A 41-year-old woman presented with a 6-month history of an increasing palpable mass in the right breast. She had fallen down the stairs and hurt her right chest and knee a year earlier and had undergone a knee surgery. Mammography showed an 8.5-cm round high-density mass and a 6-cm oval mass with relatively circumscribed margins in the retromammary area of the right breast (Figure 1A). Sonography revealed a large oval circumscribed hypoechoic mass in the retromammary area of the right upper breast. Another hypoechoic mass, which had fistulous connections with the lesions in the chest wall and thoracic cavity, was observed in the right lower