Figure 6a. MR images acquired in a 55-year-old patient who underwent breast MR imaging for routine follow-up after breast-conservation therapy and radiation therapy of her right breast 2 years previously. (a) Precontrast and (b) early postcontrast subtracted MR images (220/4.5; flip angle, 80°) from the dynamic breast study reveal a small lesion (arrow) with intermediate enhancement in the upper outer quadrant of the contralateral (left) breast. There is no enhancement in the scar tissue from the tumor removal on the right side. (c) Time–signal intensity curve of the lesion in the left breast shows that the early-phase enhancement rate is 75%. The x axis shows the dynamic imaging beginning time in seconds, and the y axis shows the intensity in arbitrary units. There is a washout of signal intensity in the intermediate postcontrast period, corresponding to a type III curve. Excisional biopsy findings confirmed the presence of a 6-mm invasive tubular breast cancer. There was no axillary lymph node involvement.