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Etiologies of pulmonary infections according to CT-scan patterns. 
CMV cytomegalovirus, GM galactomannan, HSV herpes simplex virus,
infections according to CT-scan ... Bacterial pneumonia - Aspergillosis ... Actinomyces - Aspergillosis ... Bacterial pneumonia - Aspergillosis ... oxtvmJe1RmlxFFJpzgymkqdNRFOw%3D%3D #CT
Halo Sign on Chest CT
 • SPN or mass surrounded by a circumferential GGO
 • DDx:
Sign on Chest CT ... invasive pulm aspergillosis ... #Halo #Sign #CT
Air Crescent Sign on Chest CT
 • Crescentic or circumferential rim of radiolucent airspace within a
Sign on Chest CT ... DDx: Invasive aspergillosis ... Crescent #Sign #CT
Allergic Bronchopulmonary Aspergillosis (ABPA)
WHAT IS IT?
Hypersensitivity response to Aspergillus fumigatus in the airways
 • Primarily affects
Bronchopulmonary Aspergillosis ... CAN YOU SEE ON CT ... Bronchopulmonary #Aspergillosis
Mucoid impaction
Mucus plugs or mucoid impaction can mimick the appearance of lung nodules or a mass.
Sometimes
bronchopulmonary aspergillosis ... CT demonstrated
Bronchiectasis - Permanent dilation of an airway
WHAT CAN YOU SEE ON CT?
1) Lack of tapering of
CAN YOU SEE ON CT ... Bronchopulmonary Aspergillosis
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
kansasii, Invasive aspergillosis ... Mycetoma, Invasive Aspergillosis ... • CT: Halo sign
Lung Abscess - Diagnosis and Management Summary

Lung Abscess Etiology:
 • Necrosis of lung parenchyma by a
seen • Chest CT ... • Fungal: - Aspergillosis
IDSA Aspergillosis Treatment
 • Invasive pulmonary aspergillosis (IPA)
 • CNS aspergillosis
 • Cardiac Aspergillus infection
 •
IDSA Aspergillosis ... Invasive pulmonary aspergillosis ... (IPA) • CNS aspergillosis ... ID_fellows #Invasive #Aspergillosis
Pulmonary Aspergillosis
Main Culprits: Aspergillus fumigatus, Less commonly: Aspergillus flavus, Aspergillus terreus
Diagnosis: Characteristic imaging + symptoms +
Pulmonary Aspergillosis ... Acute - Invasive Aspergillosis ... Chronic Necrotizing Aspergillosis ... cavitary pulmonary aspergillosis ... fibrosing pulmonary aspergillosis