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Pleural effusion is not always visible as a meniscus in the costophrenic angle. 
A subpulmonic effusion
Pleural effusion ... A subpulmonic effusion ... #Clinical #Radiology ... #CXR #CHF #Pleural ... SubpulmonicEffusion #RadiologyAssistant
Pleural fluid
It takes about 200-300 ml of fluid before it comes visible on an CXR (figure).
About
visible on an CXR ... #Diagnosis #Radiology ... #Pulmonary #CXR ... #Effusion #Hidden ... Volume #Diagram #RadiologyAssistant
Here are the most common examples of these four patterns on a chest x-ray (click image
consolidation - Multifocal ill-defined ... Masses Atelectasis #Diagnosis ... #Clinical #Radiology ... #CXR #Consolidation ... #Patterns #RadiologyAssistant
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
can suggest the diagnosis ... lesions abutting the pleura ... #Clinical #Radiology ... #CXR #CTChest # ... SepticEmboli #Cavity #RadiologyAssistant
Here another patient who had valve-replacement.
Notice the large heart size.
There is redistribution of the pulmonary vessels
#Clinical #Radiology ... #CTS #CXR #PostSurgical ... #Pericardial #Effusion ... PulmonaryEdema #RadiologyAssistant
HRCT findings in OP
- Bilateral peripheral consolidations, sharply demarcated.
- Consolidations may be migratory.
- Lesions may show
effusions and parenchymal ... carcinoma, the diagnosis ... #Clinical #Radiology ... Organizing #Pneumonia #ILD ... #RadiologyAssistant
Pleural effusion is bilateral in 70% of cases of CHF.
When unilateral, it is slightly more often
Pleural effusion ... If pleural effusion ... #Clinical #Radiology ... #CXR #CHF #Pleural ... #RadiologyAssistant
Pleural fluid may become encysted.
Here we see fluid entrapped within the fissure.
This can sometimes give the
Pleural fluid may ... #Clinical #Radiology ... #CXR #Lateral # ... Effusion #Fissure ... #Pseudotumor #RadiologyAssistant
Cryptogenic Organizing Pneumonia (COP)

Cryptogenic Organizing Pneumonia Overview:
 • Idiopathic form of organizing pneumonia
 • formerly BOOP
Organizing Pneumonia - Clinical ... - Imaging: • CXR ... Rare: pleural effusions ... , pleural thickening ... BOOP #pulmonary #ILD
The retracted visceral pleura is seen (blue arrow) which indicates that there is a pneumothorax.
There is
retracted visceral pleura ... only key to the diagnosis ... #Clinical #Radiology ... #CXR #Pneumothorax ... Hydropneumothorax #RadiologyAssistant