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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
pattern includes abnormalities ... Emphysema - Lung cysts ... (LAM, LIP, Langerhans ... TractionBronchiectasis #Cysts ... Emphysema #SignetRing #RadiologyAssistant
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Lymphangiomyomatosis (LAM ... ): uniform cysts ... bizarre shaped cysts ... Pattern #Comparison #Table ... #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 ... CTChest #Cystic #Cysts ... Differential #Comparison #Table ... #RadiologyAssistant
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
multiple thick walled cysts ... Lymphangiomyomatosis (LAM ... ): regular cysts ... Pattern #Comparison #Table ... #RadiologyAssistant
On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung cysts ... Cystic #Comparison #LAM ... Histiocytosis #RadiologyAssistant
Nodular pattern(2)
1. Sarcoidosis: nodules with perilymphatic distribution, along fissures, adenopathy.
2. TB: Tree-in-bud appearance in a patient
before the typical cysts ... Pattern #Comparison #Table ... #RadiologyAssistant
The table on the left is the overall table for mediastinal masses.
In the next paragraphs we
The table on the ... is the overall table ... Tumors - Benign Cysts ... tumors - Foregut cysts ... Middle #Posterior #RadiologyAssistant
Key findings in Lymphangiomyomatosis:
Numerous thin-walled cysts, surrounded by normal parenchyma.
Cysts range from 2mm to 5cm in
Numerous thin-walled cysts ... Cysts range from ... Cysts are distributed ... thickness of the cysts ... #Cystic #RadiologyAssistant
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
low attenuation (table ... When the cysts have ... seen and in many cases ... #Differential #RadiologyAssistant
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
before the typical cysts ... Differential #Comparison #Table ... #RadiologyAssistant