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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
The fourth pattern ... cysts (LAM, LIP ... Diagnosis #Radiology #Pulmonary ... #CTChest #LowAttenuation ... Emphysema #SignetRing #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
in interstitial lung ... The cystic pattern ... in many cases UIP ... Diagnosis #Radiology #Pulmonary ... #Differential #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Low Attenuation pattern ... low attenuation areas ... #Clinical #Radiology ... #HRCT #CTChest ... #Table #RadiologyAssistant
On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung ... cysts. ... #Clinical #Diagnosis ... #Radiology #CTChest ... #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Low Attenuation pattern ... low attenuation areas ... #Clinical #Radiology ... #HRCT #CTChest ... #Table #RadiologyAssistant
UIP
UIP is a histologic pattern of pulmonary fibrosis.
On a chest X-ray UIP manifests as a reticular
pattern of pulmonary ... On a chest X-ray ... at the lung bases ... #Clinical #Radiology ... #Honeycombing #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
have specific patterns ... findings of NSIP, UIP ... Diagnosis #Radiology #Pulmonary ... #CTChest #Idiopathic ... ILD #Findings #RadiologyAssistant
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... cyst in the upper ... airways leading to pulmonary ... #Clinical #Radiology ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
or interstitial lung ... in ground glass pattern ... Diagnosis #Radiology #Pulmonary ... #CTChest #GGO # ... #Differential #RadiologyAssistant
Figure 3 HRCT-LUS correlation in normal lung, pulmonary congestion, rheumatoid lung disease, idiopathic pulmonary fibrosis.
Notes: (A)
, pulmonary congestion ... artifact); (G) UIP ... pattern with subpleural ... #Clinical #Diagnosis ... #HRCT #POCUS #Lung