CXR 胸部x光判讀 pulmonary embolism

Left lung oligemia (Westermark sign)



pulmonary embolism in left pulmonary artery


pulmonary infarction



1. Only 10% involve the upper lobe
2. pulmonary infarction 10-15%, wedge-shaped
3. Westermark’s sign (focal oligemia) Palla’s sign (prominent right descending pulmonary artery)
4. Pleural effusion
5. Elevated the diaphram

References: Radiology of Chest Diseases