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Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
Lung Infections ... • Pleuritic chest ... • CT: Halo sign ... Lymphadenopathy, Chest ... : • Chest pain
The PA-film shows a silhouette sign of the left heart border.
Even without looking at the lateral
shows a silhouette sign ... anteriorly in the left lung ... #Clinical #Radiology ... #CXR #Pneumonia ... SilhouetteSign #RadiologyAssistant
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
CT demonstrates ... abutting the pleura, air-bronchograms ... feeding vessel sign ... #Clinical #Radiology ... SepticEmboli #Cavity #RadiologyAssistant
COVID-19 Patterns of Lung Findings on Chest CT
1. Reverse Halo Sign
2. ARDS
3. Crazy-Paving Pattern
4. Bilateral Peripheral
19 Patterns of Lung ... CT 1. ... Reverse Halo Sign ... Organizing Pneumonia ... #CTChest #diagnosis
Feeding Vessel Sign on Chest CT
 • Distinct pulmonary vessel leading into a lung nodule or
Feeding Vessel Sign ... on Chest CT • ... #CT #Lung #Pulmonary ... #diagnosis #radiology ... #clinical
Lobar pneumonia
On the chest x-ray there is an ill-defined area of increased density in the right
On the chest x-ray ... Notice the air-bronchogram ... weight loss or long ... #Clinical #Radiology ... #RadiologyAssistant
Halo Sign on Chest CT
 • SPN or mass surrounded by a circumferential GGO
 • DDx:
Halo Sign on Chest ... CT • SPN or mass ... #CT #Lung #Pulmonary ... #diagnosis #radiology ... #clinical
Pneumonia on Chest Xray and POCUS

Extensive pneumonia in lower left lobe (red arrow). 
POCUS: Dynamic air
Pneumonia on Chest ... POCUS: Dynamic air ... CXR #Comparison #Clinical ... #Lung #Pulmonary ... #Clinical
Air Bronchogram Sign on Chest CT
 • Patent airways surrounded by opacified lung
 • DDx: pna,
Air Bronchogram ... Sign on Chest CT ... #CT #Lung #Pulmonary ... #diagnosis #radiology ... #clinical
Monod Sign on Chest CT
 • Air surrounding a fungal ball in a preexisting pulmonary cavity
Monod Sign on Chest ... CTAir surrounding ... #CT #Lung #Pulmonary ... #diagnosis #radiology ... #clinical