What is the most likely diagnosis? 
              
- 34 year-old immunocompromised male
 
              
                
                Frontal and Lateral Radiographs of the Chest
              
                - Mitral Stenosis 
 
                - Eosinophilic Granuloma
 
                - Pneumocystis Pneumonia
 
                - Emphysema
 
                - Multiple AVMs
 
              
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                  Answer:
               
              
                3. Pneumocystis Pneumonia
                 
              
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              Pneumocystis Pneumonia
                
              General Considerations
              
                - Most       common cause of interstitial pneumonia in immunocompromised patients
 
                - Organism 
 
                
                  - Protozoan        / fungus Pneumocystis carinii (jiroveci)