FIG. 2.

Representative case of obstruction resulting in entire-lung collapse. Patient with metastatic squamous cell carcinoma of the lung presented with hemoptysis, respiratory distress, and malignant obstruction resulting in collapse of the entire left lung (A). Palliative radiation with 8 Gy in 1 fraction was delivered to the left hilum through AP/PA fields. Treatment plan isodose curves on coronal and axial imaging were as shown (B). Follow-up CT imaging two months after treatment revealed significantly improved lung aeration, decreased size of the hilar mass, and re-expansion of the left lung (C).