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Based on the images alone, it is usually not possible to determine the cause of the
determine the cause ... or chronic illness ... Lobar pneumonia ... with cough and fever ... nodular interstitial lung
Non-Resolving Pneumonias: Etiologies
Unusual Infections:
 - Immunocompromised patients (e.g.: Mycobacterium, Aspergillosis, Nocardia)
 - Endemic Fungi (e.g.: Histoplasmosis,
psittaci/avian, leptospirosis ... yersinia/rats, Q fever ... ) - Returning travelers ... Eosinophilic PNA (acute ... or chronic)
It is very important to differentiate between acute consolidation and chronic consolidation, because it will limit
differentiate between acute ... chronic consolidation ... - Lung neoplasms ... Diagnosis #Radiology #Pulmonary ... #Acute #Chronic
Fever in Returning Travelers from Tropical Regions - Frequent Differential Diagnoses
Medical History:
 • Skin exposure to
Travelers from ... , acute HIV infection ... Cough, dyspnea - Pneumonia ... melioidosis, typhoid, pulmonary ... , Lassa fever, acute
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
dyspnea • Lobar consolidation ... Abdominal pain, chronic ... Legionella: • Nausea ... factor • May cause ... Infections #HIV #AIDS #pulmonary
Causes of Cough and Hemoptysis
Acute Inflammation 
 - Laryngitis 
 - Tracheobronchitis 
 - Mycoplasma and
and Hemoptysis Acute ... Mycoplasma and Viral Pneumonias ... - Bacterial Pneumonias ... Tuberculosis - Lung ... Cancer of the Lung
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 ... (DIP), Acute interstitial ... : Acute, Chronic ... #causes
Causes of Acute Pediatric Cough - Differential Diagnosis Algorithm
No Fever, No Tachypnea
 - Normal Chest Auscultation
Causes of Acute ... No Fever, No Tachypnea ... Fever, Tachypnea ... - CXR Shows Consolidation ... #Causes #Peds #
Cavitary Lung Disease - Differential Diagnosis and Workup Algorithm
Acute / Subacute:
 • Acute Infections: Lung abscess,
Acute / Subacute ... : • Acute Infections ... Necrotizing Pneumonia ... 12 weeks): • Chronic ... #lesion #pulmonary
Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
weight loss or long ... include the list of causes ... of chronic consolidation ... This was an acute ... caused by Streptcoccus