Clinical haematology · UKMLA & AKT
Plain radiography (X-ray)
A free high-yield preview for the UKMLA Applied Knowledge Test, covering how to recognise this condition. The full SA Note notes add investigations, management and complications, with practice questions on this topic.
Key high-yield points
- A plain radiograph is a summation image - all structures in the beam's path are superimposed. Structures absorbing more X-rays appear white (radio-opaque); those absorbing fewer appear black (radiolucent).
- Silhouette sign - two adjacent structures of the same density obliterate each other's border; loss of a normally visible border localises pathology
- Right heart border loss = right middle lobe; left heart border loss = lingula; diaphragm border loss = lower lobe
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