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Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
Lobar pneumonia ... the right upper lobe ... include the list of causes ... caused by Streptcoccus ... pneumoniae.
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
, Cryptococcal pneumonia ... - 20% of pneumonias ... Legionella: • Nausea ... factor • May cause ... reported in 100% of cases
Radiographic patterns of pneumonia and pathogens to consider.

Cannot be entirely relied upon.  However, they can
Radiographic patterns of pneumonia ... provide useful clues ... #Pneumonia #Patterns ... #Radiographic #ChestXRay
Lung Segment Anatomy Annotated on Chest CT
Right Lung:
 • Upper Lobe: Apical, Posterior, Anterior
 • Middle
Lung: • Upper Lobe ... Anterior • Middle Lobe ... Medial • Lower Lobe ... Lung: • Upper Lobe ... radiopaedia.org/cases
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 ... is interstitial pneumonia ... PCP Mycoplasma pneumonia
Pathogens in Pneumonia

Here is a quick review of the pathogens causing pneumonia (useful for enumerating differentials
Pathogens in Pneumonia ... pathogens causing pneumonia ... your grand rounds/cases ... FACTOR): - S. pneumoniae ... #Microbiology #Causes
Childhood Immunization Schedule: Why we immunize
 • Diphtheria Toxin -> URT inflammation causes pseudomembrane with hardened
respiratory failure, pneumonia ... rhinorrhea, cough; pneumonia ... , pharyngitis; pneumonia ... Streptococcus pneumoniae ... otitis media; pneumonia
Interstitial Lung Diseases (ILD)
Exposure-Related ILD (a.k.a. extrinsic allergic alveolitis): 
 • Hypersensitivity pneumonitis, Farmer's lung, Bird
ILD caused by inhalation ... Cryptogenic organizing pneumonia ... Acute interstitial pneumonia ... • Eosinophilic pneumonia ... differential #pulmonary #causes
The PA-film shows a silhouette sign of the left heart border.
Even without looking at the lateral
consolidation due to a pneumonia ... caused by Sterptococcus ... pneumoniae. ... Radiology #CXR #Pneumonia
Pediatric Acute Abdominal Pain - Differential Diagnosis Algorithm
Generalized/Migratory:
 • Intussusception
 • Gastroenteritis
 • Viral Illness
 •
• Right Lower Lobe ... Pneumonia Left ... • Left Lower Lobe ... Pneumonia Right ... Diagnosis #Algorithm #Causes