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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
result in decreased lung ... - Emphysema - Lung ... Radiology #Pulmonary #CTChest ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung ... Lymphangiomyomatosis, LIP ... Diagnosis #Radiology #CTChest ... #Cystic #Comparison ... #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
: 'signet ring sign ... central dot. - LIP ... Diagnosis #Radiology #CTChest ... #Differential #Comparison ... #Table #RadiologyAssistant
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
feeding vessel sign ... feeding vessel sign ... densities iin the left lung ... Radiology #CXR #CTChest ... SepticEmboli #Cavity #RadiologyAssistant
Consolidation is synonymous with airspace disease.
When you think of the causes of consolidation, think of 'what
replacing the air ... fibrosis as in UIP ... , NSIP and long ... Radiology #Pulmonary #CTChest ... #Differential #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
the result of air ... or interstitial lung ... predominance: UIP ... Radiology #Pulmonary #CTChest ... #Differential #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... involvement of the lung ... , OP and LIP have ... Radiology #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
Pneumonia on Chest Xray and POCUS

Extensive pneumonia in lower left lobe (red arrow). 
POCUS: Dynamic air
Pneumonia on Chest ... POCUS: Dynamic air ... AirBronchogram #POCUS #CXR #Comparison ... #Clinical #Lung
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
Notice the air-fluid ... attached to the chest ... There is a lung ... with a cystic lung ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Luftsichel Sign in Left Upper Lobe Collapse - Chest X-Ray

An upper lobe collapse causes the collapse
Luftsichel Sign ... Lobe Collapse - Chest ... causes the collapse lung ... #Luftsichel #Sign ... clinical #radiology #Chest