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Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
• Pleuritic chest ... • CT: Halo sign ... Lymphadenopathy, Chest ... breath, Fatigue, Chest ... : • Chest pain
COVID-19 Patterns of Lung Findings on Chest CT
1. Reverse Halo Sign
2. ARDS
3. Crazy-Paving Pattern
4. Bilateral Peripheral
Findings on Chest ... CT 1. ... Organizing Pneumonia ... Pulmonary #ChestCT #radiology ... #CTChest #diagnosis
Feeding Vessel Sign on Chest CT
 • Distinct pulmonary vessel leading into a lung nodule or
Feeding Vessel Sign ... on Chest CT • ... Feeding #Vessel #Sign ... #CT #Lung #Pulmonary ... #diagnosis #radiology
Venn Diagram - Does this patient have pneumonia?
Diagnosis is generally based on three lines of evidence:
evidence of a chest ... , CT, ultrasound ... Inflammation (e.g., fever ... production, pleuritic chest ... pain) and signs
Halo Sign on Chest CT
 • SPN or mass surrounded by a circumferential GGO
 • DDx:
Halo Sign on Chest ... CT • SPN or mass ... .2016.12.033 #Halo #Sign ... #CT #Lung #Pulmonary ... #diagnosis #radiology
Causes of Acute Pediatric Cough - Differential Diagnosis Algorithm
No Fever, No Tachypnea
 - Normal Chest Auscultation
Algorithm No Fever ... Tachypnea - Normal Chest ... Fever, Tachypnea ... • Bacterial pneumonia ... Atypical or viral pneumonia
Signs of Pulmonary Hypertension on Chest CT
 • Main PA is dilated and larger than the
Signs of Pulmonary ... Hypertension on Chest ... CT • Main PA ... midline at the level ... #Radiology #cardiology
Pneumonia on Chest Xray and POCUS

Extensive pneumonia in lower left lobe (red arrow). 
POCUS: Dynamic air
Pneumonia on Chest ... POCUS Extensive pneumonia ... AirBronchogram #POCUS #CXR ... #Comparison #Clinical ... #Lung #Pulmonary
Chronic Cough - Differential Diagnosis Algorithm
Red Flags:
 • Fever, night sweats, chills (infection)
 • Weight loss,
Red Flags: • Fever ... Dyspnea (underlying lung ... lymadenopathy, clubbing, chest ... ) • Abnormal CXR ... refer + order CT
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
CT demonstrates ... lesions than the chest ... The chest film shows ... #Clinical #Radiology ... #CXR #CTChest #