- Focal obstruction of larger bronchi
 
        
            - Tumor can occur within trachea (squamous cell, adenoid cystic carcinoma)
 
        
            - Tumor can cause extrinsic compression (lymphoma, thyroid, esophageal, other)
 
        
      
     
   
           
        
        
        
          
          
        
        
        
          
          
            
  
      
    
    
      
        
            - Wheezing, stridor
 
        
            - Symptoms might improve if co-existent infection is treated, w/recurrence and/or progression if primary obstruction not addressed
 
        
      
     
   
           
        
        
        
          
          
            
  
      
    
    
      
        
            - Wheezing, which can be focal over airway that's obstructed
 
        
            - Tracheal process: Stridor → inspiratory & expiratory wheeze loudest over trachea
 
        
            - Adenopathy in cervical region or other palpable mass