The following CT images are from a 40 year old with high fever, cough and dyspnoea. What two radiological signs, belonging to the same condition, can you observe in the images?
The above CT images are from a patient with empyema. The two radiological signs are:
1. The Split Pleura sign: separation of the pleural layers by fluid and enhancement of the visceral and parietal pleura on a contrast enhanced CT.
2. An inverted D sign on a sagittal chest CT or a lateral chest x-ray strongly suggests an encapsulated empyema.
Here is a great article on signs in thoracic imaging: