12 results
COVID-19 Patterns of Lung Findings on Chest CT
1. Reverse Halo Sign
2. ARDS
3. Crazy-Paving Pattern
4. Bilateral Peripheral
Lung Findings on Chest ... CT 1. ... Consolidation 7. ... Organizing Pneumonia ... Patterns #Lung #Pulmonary
Atoll Sign (Reverse-Halo Sign) on Chest CT
 • Central GGO surrounded by a crescentic or circumferential
Sign) on Chest ... CT • Central GGO ... circumferential denser consolidation ... • DDx: COP, IFI ... #CT #Lung #Pulmonary
Based on the images alone, it is usually not possible to determine the cause of the
between these chest ... Pulmonary hemorrhage ... Organizing pneumonia ... (OP) - multiple ... Diagnosis #Radiology #CXR
Pulmonary Infections in HIV-AIDS
Bacterial: 
 • No organism identified, Strep pneumoniae, H. influenzae, S.aureus, Streptococcus Grp
Pulmonary Infections ... heart failure, COPD ... Evaluation: Imaging (CXR ... +/- High res CT ... chest scan), CBC
It is very important to differentiate between acute consolidation and chronic consolidation, because it will limit
diseases like organizing ... pneumonia (OP) ... proteinaceous material ... Diagnosis #Radiology #Pulmonary ... #CXR #Consolidation
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
High-Res Chest CT ... Hypersensitivity Pneumonia, COP ... Sarcoidosis, NSIP, COP ... Hemorrhage, Edema • Consolidation ... HiRes #HighRes #Chest
Pulmonary Renal Syndrome

Definition: Diffuse alveolar hemorrhage + Glomerulonephritis
Presentation (Pulmonary and renal manifestations can occur weeks apart):
• Labs: CBC, cr ... anti-GBM ab, ANA, C3, C4 ... , anti-CCPCXR ... high resolution chest ... CT • Bronchoscopy
Differential diagnosis of the reversed halo sign (RHS). AIA, angioinvasive aspergillosis; AIS, adenocarcinoma in situ; COP,
reversed halo sign ... adenocarcinoma in situ; COP ... , cryptogenic organising ... interstitial pneumonia; OP ... lesions, lobular consolidation
Bronchiectasis - Summary

What?
• Bronchiectasis is derived from the Greek words bronckos meaning airway and ectasis meaning
Loss of weight • Chest ... Nasal polyps and signs ... Physical stigmata of cor ... high-resolution chest ... Laboratory: • ANA, RF, CCP
Lung Infections in HIV - Differential Diagnosis Framework

Disease by CD4 Count:
Any CD4 Count:
 • Mycobacterium tuberculosis,
• Pleuritic CP ... • Pleuritic chest ... • CT: Halo sign ... Lymphadenopathy, Chest ... Pneumonia: • Chest