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On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung ... cysts. ... Radiology #CTChest #Cystic ... #Comparison #LAM ... Histiocytosis #RadiologyAssistant
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Cystic LCH: - LAM ... : round cysts, evenly ... #Cysts #Differential ... #Comparison #Table ... #RadiologyAssistant
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
The upper lobe is ... cyst in the upper ... lobe (red arrow ... leading to pulmonary cyst ... Lymphangioleiomyomatosis #LAM #RadiologyAssistant
Cystic Lung Disease
Upper Lobe Predominant: 
Langerhans Cell Histiocytosis, Pneumocystis Jiroveci, Hypersensitivity Pneumonitis, Neurofibromatosis Type 1, Paracoccidioidomycosis,
Cystic Lung Disease ... Upper Lobe Predominant ... Disease (LCDD), Cystic ... Disease Lower Lobe ... #Lung #Disease
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
(LAM): uniform cysts ... bizarre shaped cysts ... LowAttenuation #Cystic ... #Pattern #Comparison ... #Table #RadiologyAssistant
The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
result in decreased lung ... - Emphysema - Lung ... cysts (LAM, LIP ... Differential #Diagram #Comparison ... Emphysema #SignetRing #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
multiple thick walled cysts ... (LAM): regular cysts ... LowAttenuation #Cystic ... #Pattern #Comparison ... #Table #RadiologyAssistant
Bronchiectasis - Permanent dilation of an airway
WHAT CAN YOU SEE ON CT?
1) Lack of tapering of
Ballooning of cystic ... involving a segment or lobe ... of lung) 2) Diffuse ... involving both lungs ... Genetic Conditions (Cystic
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
the surrounding lung ... Cysts occur without ... Cysts usually contain ... #Emphysema #Comparison ... #RadiologyAssistant
Pneumonia on Chest Xray and POCUS

Extensive pneumonia in lower left lobe (red arrow). 
POCUS: Dynamic air
in lower left lobe ... AirBronchogram #POCUS #CXR #Comparison ... #Clinical #Lung