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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
diseases with a ... on the basis of HRCT ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... #SignetRing #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
On HRCT there are ... On a Chest X-Ray ... #Diagnosis #Radiology ... #Pulmonary #CXR ... #Differential #RadiologyAssistant
Algorithm for nodular pattern
The algorithm to distinguish perilymphatic, random and centrilobular nodules is the following:
- Look
pattern The algorithm ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... #CTChest #NodularPattern ... #RadiologyAssistant
Ground-glass opacity
Ground-glass opacity (GGO) represents:
- Filling of the alveolar spaces with pus, edema, hemorrhage, inflammation or
resolution of the HRCT ... in ground glass pattern ... bronchiolitis #Diagnosis #Radiology ... #Pulmonary #CTChest ... #Differential #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
the dominant HR-pattern ... low attenuation (emphysema ... #Pulmonary #HRCT ... #Algorithm #ILD ... #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 ... A HRCT is needed ... #Clinical #Radiology ... #Honeycombing #RadiologyAssistant
The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
IIPs) comprise a ... morphologic findings on HRCT ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
On the left a patient with ground glass pattern in a mosaic distribution.
Some lobules are involved
with ground glass pattern ... are confluent, HRCT ... #Clinical #Radiology ... #CTChest #GGO # ... HypersenstitivityPneumonitis #RadiologyAssistant
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
Reticular pattern ... ground-glass opacity with a ... #Clinical #Radiology ... #HRCT #CTChest ... Comparison #Table #RadiologyAssistant
On the left a chest film of a 19 year old patient with Langerhans cell histiocytosis.
The
On the left a chest ... far as you can go ... #Clinical #Radiology ... #CXR #CTChest # ... Histiocytosis #Cystic #RadiologyAssistant