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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 ... #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Centrilobular emphysema ... central dot. - LIP ... #CTChest #Cystic ... #Comparison #Table ... #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Centrilobular emphysema ... #Clinical #Radiology ... #HRCT #CTChest ... Pattern #Comparison #Table ... #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Centrilobular emphysema ... #Clinical #Radiology ... #HRCT #CTChest ... Pattern #Comparison #Table ... #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
(centrilobular emphysema ... is seen in: - UIP ... edema #Diagnosis #Radiology ... #Differential #Table ... #Upper #Lower #RadiologyAssistant
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
can heal and end up ... associated pulmonary ... #CTChest #Cavity ... #Cyst #Emphysema ... #Comparison #RadiologyAssistant
Consolidation is synonymous with airspace disease.
When you think of the causes of consolidation, think of 'what
or tumor cells (Table ... fibrosis as in UIP ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... #Differential #RadiologyAssistant
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
since in many cases ... we describe a chest ... #Differential #Table ... #Lung #Pulmonary ... #Diagnosis #Radiology
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
low attenuation (table ... When the cysts have ... UIP can be suspected ... #Pulmonary #CXR ... #Differential #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
before the typical cysts ... Clinical #Diagnosis #Radiology ... #Pulmonary #CTChest ... Differential #Comparison #Table ... #RadiologyAssistant