The pathological process can be localized in the left lower lobe when the left hemidiaphragm interface is lost (“Silhouette” sign).
Compare Tissue Attenuation On x-rays because air is less dense and therefore shows up radiolucent (black), increasing amounts of soft tissue or less air shows up more radio-opaque or white. Similarly a “line” on an x-ray signifies air is present on both...
2. Evaluate for Pneumothorax – Sulcus Sign Left Image: Depicts the deep sulcus sign. Right Image: Lateral decubitis view of the pneumothorax. The pleural air will rise above the lung in this view.
