Figure 1: Comparison of imaging modalities. (a) CT shows homogeneous gray area. Borders are distinct laterally. Medially, the borders between lumpectomy cavity and breast parenchyma and chest wall are poorly defined. CVS 3. (b) T1 MRI, noncontrast, shows cavity with fairly well-defined borders, some rim enhancement. CVS 4. (c) T2 MRI noncontrast shows hyperintense signal consistent with seroma, distinct margins. CVS 5.