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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
cysts (LAM, LIP ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... LowAttenuation #Differential ... TractionBronchiectasis #Cysts
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
them from cysts ... the surrounding lung ... associated pulmonary ... Clinical #Diagnosis #Radiology ... #CTChest #Cavity
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
, like cyst, cavity ... a thick wall Cyst ... #Cavity #Cyst # ... Lung #Pulmonary ... #Diagnosis #Radiology
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
: - LAM: round cysts ... Clinical #Diagnosis #Radiology ... #CTChest #Cystic ... #Cysts #Differential ... #Comparison #Table
Water Lily Sign (Camalote Sign) on Chest CT
 • Hydatid cyst in the lung with a
Camalote Sign) on Chest ... CT • Hydatid cyst ... • DDx: Hydatid cyst ... #Pulmonary #diagnosis ... #radiology #clinical
Left Ventricular Hydatid Cyst on Cardiac MRI 

Illustrative Cardiac MRI image showing a large hydatid cyst
Ventricular Hydatid Cyst ... large hydatid cyst ... Pulmonary embolism ... #Hydatid #Cyst ... CardiacMRI #clinical #cardiology
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Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... low attenuation (table ... When the cysts have ... #Diagnosis #Radiology ... #Pulmonary #CXR
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... cyst in the upper ... airways leading to pulmonary ... cyst formation ... #Clinical #Radiology
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
before the typical cysts ... Clinical #Diagnosis #Radiology ... #Pulmonary #CTChest ... NodularPattern #Differential ... #Comparison #Table
Consolidation is synonymous with airspace disease.
When you think of the causes of consolidation, think of 'what
or tumor cells (Table ... UIP, NSIP and long ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... Consolidation #Differential