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The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... listed in the table ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... ILD #Findings #RadiologyAssistant
Central distribution is seen in sarcoidosis and cardiogenic pulmonary edema.
Peripheral distribution is mainly seen in cryptogenic
and cardiogenic pulmonary ... #Diagnosis #Radiology ... #Pulmonary #HRCT ... #Differential #Table ... Central #Peripheral #RadiologyAssistant
The PA-film shows a silhouette sign of the left heart border.
Even without looking at the lateral
anteriorly in the left lung ... Sterptococcus pneumoniae ... #Clinical #Radiology ... #CXR #Pneumonia ... SilhouetteSign #RadiologyAssistant
Lobar consolidation
The most common presentation of consolidation is lobar or segmental.
The most common diagnosis is lobar
diagnosis is lobar pneumonia ... The table lists ... #Diagnosis #Radiology ... #Pulmonary #CXR ... #Differential #RadiologyAssistant
Characteristics of Selected Pneumonias

Streptococcus pneumoniae (pneumococcus). Gram-positive diplococci. 
Haemophilus influenzae. Pleomorphic gram-negative coccobacilli. 
Staphylococcus aureus. Plump
Streptococcus pneumoniae ... Klebsiella pneumoniae ... Mycoplasma pneumoniae ... Diagnosis #Comparison #Table ... #Presentation #Pulmonary
Upper lung zone preference is seen in:
- Inhaled particles: pneumoconiosis (silica or coal)
- Smoking related diseases
Upper lung zone ... edema #Diagnosis #Radiology ... #Pulmonary #HRCT ... #Differential #Table ... #Upper #Lower #RadiologyAssistant
Multiple masses
The differential diagnostic list of multiple masses is very long.
The most important diagnoses are listed
masses is very long ... listed in the table ... #Management #Radiology ... #Lung #Multiple ... #Differential #RadiologyAssistant
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
Lung Infections ... : • Upper lung ... cough, myalgia • Lung ... Microsporidium #Lung ... Infections #HIV #AIDS #pulmonary
Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
Interstitial Lung ... Bird fanciers' lung ... • Idiopathic pulmonary ... Acute, Chronic • Pulmonary ... #differential #pulmonary
Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
Lobar pneumonia ... weight loss or long ... an acute lobar pneumonia ... #Clinical #Radiology ... #RadiologyAssistant