Collapse and consolidation on CXR

http://patient.info/doctor/chest-x-ray-systematic-approach

---

The "sail" sign on CXR

Case courtesy of Dr Ian Bickle, Radiopaedia.org, rID: 50329

---

The "sail" sign on CXR

1. Triangular density behind the heart like a "sail".
   
2. The left hilum is inferiorly displaced.
   
3. Volume loss in the left hemithorax.
   
4. Indicates lung cancer until proven otherwise.
   

Reference:
https://radiopaedia.org/cases/left-lower-lobe-collapse-8