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Here are the most common examples of these four patterns on a chest x-ray (click image
Interstitial - Reticular ... mass - Solitary Pulmonary ... Masses Atelectasis #Diagnosis ... #Clinical #Radiology ... #Patterns #RadiologyAssistant
The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
#Diagnosis #Radiology ... #Pulmonary #CTChest ... LowAttenuation #Differential ... #Diagram #Comparison ... #SignetRing #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... low attenuation (table ... #Pulmonary #CXR ... #Differential # ... RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Differential diagnosis ... Centrilobular emphysema ... #CTChest #Cystic ... #Comparison #Table ... #RadiologyAssistant
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
Patterns - Differential ... Reticular: • ... Hemorrhage, Edema • Consolidation ... Attenuation: • Emphysema ... Differential #Diagnosis
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
or an area of consolidation ... without associated pulmonary ... #Clinical #Diagnosis ... #Radiology #CTChest ... #Comparison #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
#Clinical #Diagnosis ... #CTChest #Nodular ... #Differential # ... Comparison #Table ... #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 ... : reticular nodular ... low attenuation (emphysema ... #Radiology #Pulmonary ... #HRCT #CTChest
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
Reticular pattern ... #Clinical #Radiology ... #HRCT #CTChest ... #Reticular #Pattern ... #Comparison #Table
On the left a chest film of a 19 year old patient with Langerhans cell histiocytosis.
The
film is a reticular ... patern and that's ... diagnosis in this ... #Clinical #Radiology ... Histiocytosis #Cystic #RadiologyAssistant