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Figure 11a. Radiologic-histologic discordance in a 36-year-old woman with invasive ductal carcinoma. US-guided 14-gauge core needle biopsy was performed. (a) Prefire US image shows an oval, ill-defined hypoechoic mass in the left breast that was graded as a BI-RADS category 4 lesion. (b) Postfire US image shows the mass. The histologic diagnosis was dense intralobular fibrosis and was considered discordant with the US findings. Surgical excision was performed immediately, and the mass was diagnosed as invasive ductal carcinoma.
