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Figure 5f. Transverse T1-weighted gradient-echo MR images (2D gradient-echo sequence, 290/4.6, and 90° flip angle) and corresponding time course graphs for 51-year-old woman with history of cancer in left breast who underwent follow-up MR imaging. Focal mass was present that exhibited oval shape and smooth borders. (a–c) For standard dynamic protocol (256 x 256 imaging matrix with temporal resolution of 69 seconds), internal enhancement seemed homogeneous. Arrow indicates site of lesion in (a) precontrast image, (b) first postcontrast image, and (c) subtraction of first postcontrast image (note the homogeneous internal enhancement of lesion). (d) Graph demonstrates type 1 (persistent enhancement) signal intensity time course of the enhancing lesion for standard dynamic protocol. Lesion was rated as BI-RADS category 3 (probably benign), and 6-month follow-up was recommended. (e–g) For modified dynamic protocol (512 x 400 imaging matrix with temporal resolution of 116 seconds), internal low-signal-intensity internal septations became visible. Lesion was categorized as BI-RADS category 2, and findings at long-term follow-up for 36 months confirmed presence of fibroadenoma. Arrow indicates site of lesion in (e) precontrast image, (f) first postcontrast image, and (g) subtraction of first postcontrast image. Note low-signal-intensity internal septations in f and g. (h) Graph demonstrates type 1 (persistent enhancement) signal intensity time course for modified dynamic protocol. Time course was equivalent to that seen in d.
