10 results
The distribution of nodules shown on HRCT is the most important factor in making an accurate
nodules shown on HRCT ... perilymphatic, centrilobular ... Radiology #Pulmonary #HRCT ... #NodularPattern ... #Centrilobular
Algorithm for nodular pattern
The algorithm to distinguish perilymphatic, random and centrilobular nodules is the following:
- Look
Algorithm for nodular ... and centrilobular ... distribution is likely centrilobular ... Radiology #Pulmonary #HRCT ... #CTChest #NodularPattern
Nodular pattern
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary TB: random nodules
3. Sarcoidosis: nodules with perilymphatic
pneumonitis: ill defined centrilobular ... Miliary TB: random ... Hypersensitivity pneumonitis: centrilobular ... Clinical #Radiology #HRCT ... Pattern #Comparison #Table
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
pneumonitis: ill defined centrilobular ... Miliary TB: random ... Hypersensitivity pneumonitis: centrilobular ... Nodular #Pattern #NodularPattern ... Differential #Comparison #Table
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
related diseases (centrilobular ... Radiology #Pulmonary #HRCT ... #Differential #Table
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
Centrilobular emphysema ... Notice the centrilobular ... Clinical #Radiology #HRCT ... Pattern #Comparison #Table
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Centrilobular emphysema ... Clinical #Radiology #HRCT ... Pattern #Comparison #Table
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
- Metastases: random ... ring sign'. - Centrilobular ... Differential #Comparison #Table
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 ... perilymphatic or random ... Radiology #Pulmonary #HRCT ... Interpretation #Algorithm
Metastases
Metastases are the most common cause of multiple pulmonary masses.
Usually they vary in size and are
HRCT will demonstrate ... the random distribution ... perilymphatic or centrilobular