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The idiopathic interstitial pneumonias (IIPs) comprise a heterogenous group of disorders. 
They represent fundamental responses of
responses of the lung ... indicates unknown cause ... Diagnosis #Radiology #Pulmonary ... #CTChest #Idiopathic ... ILD #Findings #RadiologyAssistant
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
Lung Infections ... Legionella: • Nausea ... factor • May cause ... reported in 100% of cases ... Infections #HIV #AIDS #pulmonary
Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
ILD caused by inhalation ... • Idiopathic pulmonary ... Acute, Chronic • Pulmonary ... #differential #pulmonary ... #causes
Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
On the chest x-ray ... weight loss or long ... include the list of causes ... caused by Streptcoccus ... #RadiologyAssistant
The PA-film shows a silhouette sign of the left heart border.
Even without looking at the lateral
anteriorly in the left lung ... caused by Sterptococcus ... pneumoniae. ... Radiology #CXR #Pneumonia ... SilhouetteSign #RadiologyAssistant
Lung Segment Anatomy Annotated on Chest CT
Right Lung:
 • Upper Lobe: Apical, Posterior, Anterior
 • Middle
Annotated on Chest ... CT Right Lung: ... radiopaedia.org/cases ... lobes #Segments #Chest ... #CT #CTChest #pulmonary
Causes of Cough and Hemoptysis
Acute Inflammation 
 - Laryngitis 
 - Tracheobronchitis 
 - Mycoplasma and
Causes of Cough ... - Bacterial Pneumonias ... Tuberculosis - Lung ... Cancer of the Lung ... #Differential #Causes
Interstitial pneumonias
An acute reticular pattern is most frequently caused by interstitial edema due to cardiac heart
Interstitial pneumonias ... most frequently caused ... The other cause ... PCP Mycoplasma pneumonia ... #PJP #RadiologyAssistant
Pathogens in Pneumonia

Here is a quick review of the pathogens causing pneumonia (useful for enumerating differentials
your grand rounds/cases ... smoking. structural lung ... Burkholderia — structural lung ... MAC (structural lung ... #Microbiology #Causes
Causes of Interstitial Lung Disease - Differential Diagnosis Algorithm
Idiopathic Interstitial Pneumonia
 • (UIP) Usual Interstitial Pneumonia
Causes of Interstitial ... Lung Disease - ... Lymphangioleiomyomatosis (LAM), • Pulmonary ... leaking out of pulmonary ... Diseases #ILD #Causes