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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
- Lung cysts (LAM ... , LIP, Langerhans ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... #SignetRing #RadiologyAssistant
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... There is a lung ... #Clinical #Radiology ... #CXR #Pneumothorax ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
effusion; sometimes pneumothorax ... Centrilobular emphysema ... #Clinical #Radiology ... #HRCT #CTChest ... Comparison #Table #RadiologyAssistant
Paraseptal emphysema is localized near fissures and pleura and is frequently associated with bullae formation (area
to spontaneous pneumothorax ... compression of adjacent lung ... #Clinical #Radiology ... #CTChest #Paraseptal ... #RadiologyAssistant
On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung ... #Clinical #Diagnosis ... #Radiology #CTChest ... Comparison #LAM #LIP ... Histiocytosis #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Centrilobular emphysema ... central dot. - LIP ... #Clinical #Diagnosis ... #Radiology #CTChest ... Comparison #Table #RadiologyAssistant
The CXR demonstrates a reticular interstitial pattern with a preference at the lung bases.
The HRCT demonstrates
The CXR demonstrates ... preference at the lung ... #Clinical #Radiology ... #CXR #UIP #CTChest ... TractionBronchiectasis #RadiologyAssistant
Here two CXRs of another patient with obvious skinfolds. The radiography was performed supine with a
Here two CXRs of ... that there are lung ... beyond the apparent pneumothorax ... #Clinical #Radiology ... #Fold #Mimic #RadiologyAssistant
On the left a chest film of a patient with UIP due to IPF.
The findings on
a patient with UIP ... changes in the basal lung ... #Clinical #Radiology ... #CXR #CTChest # ... Reticular #ILD #RadiologyAssistant
Centrilobular emphysema due to smoking. The periphery of the lung is spared (blue arrows). Centrilobular artery
Centrilobular emphysema ... periphery of the lung ... #Clinical #Radiology ... #CTChest #Centrilobular ... #RadiologyAssistant