Figure 24b. Pleural metastasis. (a) Chest CT scan obtained in a 43-year-old woman with right breast cancer who presented with dyspnea shows a large amount of right pleural effusion with mass effect and total collapse of the right lung. Note the thin, even enhancement of the parietal pleura. (b) Chest CT scan obtained in a 44-year-old woman who had undergone left MRM and mammoplasty shows left pleural effusion and irregular plaquelike pleural enhancement (arrows).