The CT demonstrates metastatic disease, the epicenter of the disease is the left pleural space (including the pleural effusion, which are common), which in combination with the calcified pleural plaques makes mesothelioma the most likely primary - these clues are present on the presentation x-ray and on the post-thoracentesis x-ray incomplete expansion of the left apex with the peripherally density represents lung entrapment. Histology results are not available for this patient.