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Here are the most common examples of these four patterns on a chest x-ray (click image
opacities - Fine Nodular ... mass - Solitary Pulmonary ... Masses Atelectasis #Diagnosis ... #Clinical #Radiology ... Consolidation #Patterns #RadiologyAssistant
Perilymphatic distribution
Perilymphatic nodules are most commonly seen in sarcoidosis.
They also occur in silicosis, coal-worker's pneumoconiosis and
in differential diagnosis ... nodules and the nodular ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... #Differential #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
diseases with a nodular ... #Clinical #Diagnosis ... #Radiology #Pulmonary ... #CTChest #Nodular ... Comparison #Table #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
the differential diagnosis ... irregular and often nodular ... #Diagnosis #Pathophys ... #Radiology #Pulmonary ... TreeInBud #Diagram #RadiologyAssistant
On the left a patient who had a CT to rule out pulmonary embolism.
There is a
CT to rule out pulmonary ... The diagnosis based ... was cardiogenic pulmonary ... #Clinical #Radiology ... SeptalThickening #CHF #RadiologyAssistant
Sarcoidosis 
Non-caseating granulomas (Composed of T-helper & inflammatory cells) 
Clinical:
 • Disease fatal in 10% of
inflammatory cells) Clinical ... polyarthritis • Pulmonary ... #Sarcoidosis #Diagnosis ... #Symptoms #Signs ... #Pulmonary
Lung Abscess
Microbiology:
 • Polymicrobial 
 • Anaerobes (most common) 
Clinical: 
 • Indolent symptoms that evolve
most common) Clinical ... • Indolent symptoms ... Lung #Abscess #Diagnosis ... #Pulmonary #Clinical
Algorithm for nodular pattern
The algorithm to distinguish perilymphatic, random and centrilobular nodules is the following:
- Look
Algorithm for nodular ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... NodularPattern #Nodular ... Differential #Algorithm #RadiologyAssistant
Based on the images alone, it is usually not possible to determine the cause of the
chronic illness, clinical ... and other non-pulmonary ... Pulmonary hemorrhage ... #Clinical #Diagnosis ... Consolidation #Causes #RadiologyAssistant
Diagnostic Algorithm for Suspected Pulmonary Embolism

Well's Criteria for PE
 • Clinical Signs and Symptoms of DVT
Diagnostic Algorithm ... for Suspected Pulmonary ... Criteria for PE • Clinical ... Signs and Symptoms ... • Alternative diagnosis