Radiology: Chest X-Ray Interpretation

What does the mnemonic 'ABCDE' stand for in a systematic approach to chest X-ray interpretation?

Airway, Bones (and soft tissues), Cardiac silhouette (and mediastinum), Diaphragm, and Everything else (lung fields and pleura).

What is the standard Cardiothoracic Ratio (CTR) threshold used to suggest cardiomegaly on a PA chest X-ray?

A CTR greater than 0.5 (or 50%) in adults.

Which radiographic view is preferred to avoid artificial magnification of the heart: PA or AP?

The PA (Posteroanterior) view is preferred because the heart is closer to the detector.

What is the 'meniscus sign' on a chest X-ray indicative of?

Pleural effusion, where fluid accumulates and curves upward against the chest wall.

What are the sharp corners where the diaphragm meets the ribs called, which often become 'blunted' in pleural effusion?

Costophrenic angles.

Where should the distal tip of an endotracheal tube (ETT) ideally be positioned on a chest X-ray?

Approximately 3 to 5 cm above the carina.

What radiographic finding is the hallmark of a pneumothorax?

The visualization of a thin, sharp visceral pleural line with an absence of lung markings peripheral to it.

What does the 'silhouette sign' describe in chest radiology?

The loss of the normal border between two structures of similar density when they are in direct contact.

Which radiographic pattern is characterized by perihilar opacification and is commonly seen in acute pulmonary edema?

The 'bat wing' or 'butterfly' pattern.

What are Kerley B lines and what do they typically indicate?

Short, horizontal lines at the lung periphery (bases) representing thickened interlobular septa, typically indicating pulmonary edema.