Figure 1. Preoperative images of the radiation induced low-grade myofibroblastic sarcoma.

(A, B) Ultrasound of the right breast shows a heterogeneous ovoid mass at the right retropectoral area with a vessel at the rim. (C) On T2-weighted imaging of the breast, magnetic resonance imaging shows a heterogeneous high signal intensity mass at the right retropectoral area. (D) Dynamic contrast-enhanced first phase of T1 subtraction imaging reveals an irregular mass with heterogeneous enhancement. (E) Diffusion restriction on diffusion-weighted imaging. (F) On positron emission tomography-computed tomography image, an increased radioactive concentration was observed, with a maximum standard uptake value of 8.1.