Benign vs malignant.
Long segment smooth narrowing favours benignity whereas short segment irregular narrowing favours malignancy.
There is abnormal heterogeneously enhancing circumferential mural thickening of infracarinal and infracardiac lower thoracic esophagus with a significant luminal compromise.
Another lymph nodal lesion is encroaching the left main bronchus proximal to its further division resulting in collapse and consolidation of the left lung.
There is thrombosis of left pulmonary artery with associated gross left pleural effusion and mild pericardial effusion.