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Figure 3b. Images in a patient with known axillary metastases and a palpable mass in the upper outer quadrant of the breast. (a) Mediolateral oblique mammogram reveals a mass (arrow) in the superior part of the breast near the skin marker. No other suspicious finding was identified. Ultrasonographic (US) examination of the palpable mass demonstrated a hypoechoic mass, which at core biopsy proved to be a metastatic intramammary node. (b) Sagittal fat-suppressed contrast-enhanced three-dimensional fast spoiled gradient-recalled-echo MR image (9.3/2.2) reveals an enhancing 1.5-cm mass (arrow) with irregular borders in the central part of the breast. At mastectomy, a 1.5-cm infiltrating ductal carcinoma was identified in a location corresponding to the MR imaging-detected lesion.