15 results
Atoll Sign (Reverse-Halo Sign) on Chest CT
 • Central GGO surrounded by a crescentic or circumferential
Atoll Sign (Reverse-Halo ... circumferential denser consolidation ... • DDx: COP, IFI ... Sign #CT #Lung #Pulmonary ... #diagnosis #radiology
Cryptogenic Organizing Pneumonia (COP)

Cryptogenic Organizing Pneumonia Overview:
 • Idiopathic form of organizing pneumonia
 • formerly BOOP
Organizing Pneumonia (COP ... • Secondary OP ... - Imaging: • CXR ... Anti-dsDNA, ANCA COP ... Organizing #Pneumonia #COP
HRCT findings in OP
- Bilateral peripheral consolidations, sharply demarcated.
- Consolidations may be migratory.
- Lesions may show
HRCT findings in OP ... of OP. ... carcinoma, the diagnosis ... Clinical #Radiology #CTChest ... #COP #Cryptogenic
Differential diagnosis
The table summarizes the most common diseases, that present with consolidation.
Chronic diseases are indicated in
Differential diagnosis ... organizing pneumonia (OP ... OP is organizing ... called cryptogenic (COP ... #Pulmonary #CXR
It is very important to differentiate between acute consolidation and chronic consolidation, because it will limit
the differential diagnosis ... organizing pneumonia (OP ... proteinaceous material ... #Diagnosis #Radiology ... #Pulmonary #CXR
Based on the images alone, it is usually not possible to determine the cause of the
between these chest ... Pulmonary hemorrhage ... Organizing pneumonia (OP ... #Clinical #Diagnosis ... #Radiology #CXR
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
- Differential Diagnosis ... Hypersensitivity Pneumonia, COP ... Sarcoidosis, NSIP, COP ... Hemorrhage, Edema • Consolidation ... #pulmonary #radiology
Pulmonary Renal Syndrome

Definition: Diffuse alveolar hemorrhage + Glomerulonephritis
Presentation (Pulmonary and renal manifestations can occur weeks apart):
Differential Diagnosis ... , C3, C4, anti-CCP ... • CXR (diffuse ... high resolution chest ... #differential #diagnosis
Differential diagnosis of the reversed halo sign (RHS). AIA, angioinvasive aspergillosis; AIS, adenocarcinoma in situ; COP,
Differential diagnosis ... adenocarcinoma in situ; COP ... interstitial pneumonia; OP ... lesions, lobular consolidation ... #Diagnosis #Pulmonary
Bronchiectasis - Summary

What?
• Bronchiectasis is derived from the Greek words bronckos meaning airway and ectasis meaning
Physical stigmata of cor ... centrilobular nodules, or consolidation ... parenchyma Diagnosis ... Laboratory: • ANA, RF, CCP ... #differential #diagnosis