Figure 8a. Left breast cancer in a 31-year-old woman who had undergone BCS and irradiation. (a) Portal radiograph demonstrates a tangential beam radiation field. (b) Radiograph obtained 4 months after completion of radiation therapy shows ill-defined haziness in the lateral part of the left midlung (arrow). (c) CT scan obtained 4 months after the radiograph in b demonstrates consolidation with a sharp posterior margin peripherally in the left upper lobe (arrows) that conforms to the shape of the tangential beam radiation field.