Fig. 4.

Treatment response of radiation therapy assessed by computed tomography (CT). (A) Axial CT image before radiation therapy. Red arrow shows the primary breast tumor. (B) Axial CT image before radiation therapy. Red and green arrows show the primary breast tumor and ipsilateral breast metastasis, respectively. (C) Axial CT image before radiation therapy. Blue and yellow arrows show the ipsilateral and contralateral breast metastases, respectively. (D) Axial CT image at 4 months after radiation therapy. The primary breast tumor shows a clinically complete response, referred to by the red arrow in part A. (E) Axial CT image at 4 months after radiation therapy. The primary breast tumor and ipsilateral breast metastasis show clinically complete response, referred to by red and green arrows in part B. (F) Axial CT image at 4 months after radiation therapy. The ipsilateral and contralateral breast metastases show a clinically partial response, referred to by blue and yellow arrows in part C.