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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
The fourth pattern ... - Lung cysts (LAM ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... LowAttenuation #Differential
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
adenopathy and pleural effusion ... Centrilobular emphysema ... low attenuation areas ... #Clinical #Radiology ... #HRCT #CTChest
Palpable Skin Crepitus on Physical Exam

Notice these air bubbles under the skin. An 86-year-old woman with
sudden-onset shortness of breath ... neck (shown in video ... from these areas ... in subcutaneous areas ... under the skin as long
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Hemorrhagic Pericardial Effusions (Hemopericardium)- Differential Diagnosis Framework

IATROGENIC DISEASE
Secondary to invasive cardiac procedures

NONIATROGENIC
• Malignancy (e.g., metastatic spread:
Hemopericardium)- Differential ... metastatic spread: lung ... cancer, breast ... and other CTD TIP ... #Diagnosis #cardiology
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
terms to describe areas ... pneumatocele, emphysema ... we describe a chest ... is to describe areas ... #CXR #Lucency #Differential
Lung abnormalities mostly present as areas of increased density, which can be divided into the following
mostly present as areas ... Less frequently areas ... are seen as in emphysema ... published soon: Chest ... #CXR #Lung #Patterns
Acute interstitial pneumonia (AIP, earlier named Hamman Rich Pneumonitis) is a rare idiopathic lung disease characterized
rare idiopathic lung ... The histologic pattern ... There are areas ... and extensive areas ... #CTChest #AIP #
Mosaic attenuation
The term 'mosaic attenuation' is used to describe density differences between affected and non-affected lung
areas. ... There are patchy areas ... with air-trapping ... #Pulmonary #CTChest ... #Attenuation #Differential
Chronic hypersensitivity pneumonitis (2)
The case on the left shows an inspiratory and expiratory scan: the mosaic
with areas of ground-glass ... attenuation and areas ... mid and lower lung ... included in the differential ... #CTChest #Chronic
On the left a patient who is treated with cytotoxic drugs for a hematologic malignancy.
The radiographic
radiographic findings are areas ... patients with a UIP ... consider drug-related lung ... disease in the differential ... #CTChest #DrugInduced