You have reported this CT and the respiratory doctor wants to know what the diagnosis is?
Bronchogenic cyst which has presumably enlarged / got infected.
Large homogenous mass within the middle mediastinum with gross mass effect on adjacent structures. Hounsfield units measure 40-50 on this contrast enhance study. The left atrium is slit like and the right main pulmonary artery is significantly displaced.
Bilateral lung opacities with septal thickening most apparent within the left lower lobe. Images are significantly degraded and demonstrate how acutely unwell this patient is.