Figure 2. Pathologic findings of the radiation induced low-grade myofibroblastic sarcoma.

(A) Photomicrography of the surgical specimen shows diffuse infiltration growth, with arrangements of cellular fascicles or storiform pattern (H&E, ×40). (B) Photomicrography shows diffuse infiltrative growth of smooth muscle actin-positive spindle cells. (C) Photomicrography shows moderate nuclear atypia, at least focally present (H&E, ×200). (D) The neoplastic cells have pale eosinophilic cytoplasm and elongated fusiform nuclei with evenly distributed chromatin. Increased proliferative activity, was demonstrated as mitoses (arrows) and hyperchromatic nuclei (H&E, ×200).

H&E = hematoxylin and eosin.