Dr. Gerald Diaz @GeraldMD
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Board Certified Internal Medicine Hospitalist, GrepMed Editor in Chief πŸ‡΅πŸ‡­ πŸ‡ΊπŸ‡Έ - Sign up for an account to like, bookmark and upload images to contribute to our community platform. Follow us on IG: https://www.instagram.com/grepmed/ | Twitter: https://twitter.com/grepmeded/
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Nodular pattern
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary TB: random nodules
3. Sarcoidosis: nodules with perilymphatic
Hypersensitivity pneumonitis: ill ... defined centrilobular ... Clinical #Radiology #HRCT ... #CTChest #Nodular ... Comparison #Table #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
related diseases (centrilobular ... bronchiolitis (RB-ILD ... Radiology #Pulmonary #HRCT ... #Upper #Lower #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Centrilobular emphysema ... Notice the centrilobular ... Clinical #Radiology #HRCT ... #CTChest #LowAttenuation ... Comparison #Table #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
defined centrilobular ... bronchiolitis: ill ... defined centrilobular ... Radiology #Pulmonary #CTChest ... Comparison #Table #RadiologyAssistant
Algorithm for nodular pattern
The algorithm to distinguish perilymphatic, random and centrilobular nodules is the following:
- Look
perilymphatic, random and centrilobular ... distribution is likely centrilobular ... Radiology #Pulmonary #HRCT ... #CTChest #NodularPattern ... Differential #Algorithm #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Centrilobular emphysema ... Clinical #Radiology #HRCT ... #CTChest #LowAttenuation ... Comparison #Table #RadiologyAssistant
The distribution of nodules shown on HRCT is the most important factor in making an accurate
nodules shown on HRCT ... diagnosis in the nodular ... Radiology #Pulmonary #HRCT ... NodularPattern #Nodular ... Comparison #Diagram #RadiologyAssistant
Tree-in-bud
In centrilobular nodules the recognition of 'tree-in-bud' is of value for narrowing the differential diagnosis.
Tree-in-bud describes
Tree-in-bud In centrilobular ... irregular and often nodular ... or pus-filled) centrilobular ... Radiology #Pulmonary #CTChest ... TreeInBud #Diagram #RadiologyAssistant
Basic Interpretation
A structured approach to interpretation of HRCT involves the following questions:
What is the dominant HR-pattern:
reticular
nodular
high
interpretation of HRCT ... secondary lobule (centrilobular ... #CTChest #Interpretation ... #Algorithm #ILD ... #RadiologyAssistant
Nodular pattern(2)
1. Sarcoidosis: nodules with perilymphatic distribution, along fissures, adenopathy.
2. TB: Tree-in-bud appearance in a patient
Nodular pattern( ... histiocytosis: early nodular ... Clinical #Radiology #HRCT ... #CTChest #Nodular ... Comparison #Table #RadiologyAssistant