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Central distribution is seen in sarcoidosis and cardiogenic pulmonary edema.
Peripheral distribution is mainly seen in cryptogenic
Central distribution ... Peripheral distribution ... Differential #Table #Distribution ... Central #Peripheral #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
perilymphatic distribution ... Metastases: random distribution ... cysts, evenly distribution ... Comparison #Table #RadiologyAssistant
The distribution of nodules shown on HRCT is the most important factor in making an accurate
The distribution ... Perilymphatic distribution ... perilymphatic distribution ... Random distribution ... Comparison #Diagram #RadiologyAssistant
Batwing
A bilateral perihilar distribution of consolidation is also called a Batwing distribution.
The sparing of the periphery
bilateral perihilar distribution ... called a Batwing distribution ... reverse Batwing distribution ... #Differential #RadiologyAssistant
Algorithm for nodular pattern
The algorithm to distinguish perilymphatic, random and centrilobular nodules is the following:
- Look
in number, the distribution ... periplymphatic distribution ... likely a random distribution ... Differential #Algorithm #RadiologyAssistant
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Differential #Table #Distribution ... #Upper #Lower #RadiologyAssistant
Shock - Differential Diagnosis Algorithm
Warm Extremities
 - Distributive Shock - Low JVP
Extremities - Distributive ... Decompensated Distributive ... Interstitial Fluid Redistribution
Central Distribution, Febrile / Ill:
 - Viral Exanthem 
 - Lyme Disease (erythema migrans) 
Central Distribution,
Central Distribution ... migrans) Central Distribution ... ) Peripheral Distribution ... Peripheral Distribution ... non-ill, flexor distribution
Nodular pattern
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary TB: random nodules
3. Sarcoidosis: nodules with perilymphatic
perilymphatic distribution ... Comparison #Table #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
perilymphatic distribution ... perilymphatic distribution ... Comparison #Table #RadiologyAssistant