PMC5856988_01
Representative axial slices from the partially wide tangent treatment showing A) increased coverage of the lungs in the tangent in the region of the internal mammary nodes and B) the inferior portion of the tangent field with less coverage of the normal lung tissue.
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Representative axial slices from the treatment with corresponding isodose lines are shown in Figure 1.
Serial computed tomography imaging of the thorax. A) Image at 1 month postlumpectomy shows seroma in the lumpectomy bed and several small lung cysts, without evidence of pneumonthorax. B) Four months postradiation, there is spontaneous pneumonthorax in the region of the tangent radiation, and persistent lung cysts can be observed bilaterally. C) Eight months postradiation, there is repeat pneumothorax, partially loculated and subcutaneous emphysema is noted as well. Lung cysts persist bilaterally.
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Four months after the end of radiation treatment, the patient had a routine follow-up computed tomography (CT) scan of the chest, abdomen, and pelvis, which revealed a spontaneous pneumothorax in the region of the prior radiation (Fig 2).