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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Emphysema - Lung cysts ... (LAM, LIP, Langerhans ... Radiology #Pulmonary #CTChest ... TractionBronchiectasis #Cysts
Low Attenuation pattern 
1. Lymphangiomyomatosis (LAM): uniform cysts in woman of child-bearing age; no history of
Lymphangiomyomatosis (LAM ... ): uniform cysts ... bizarre shaped cysts ... Radiology #HRCT #CTChest
On the left three different patients with lung cysts.
From left to right: Lymphangiomyomatosis, LIP and Langerhans
patients with lung cysts ... Diagnosis #Radiology #CTChest ... Cystic #Comparison #LAM
Differential diagnosis of Langerhans cell histiocytosis.
Nodular LCH:
- Sarcoidosis: perilymphatic distribution.
- Metastases: random distribution.
Cystic LCH:
- LAM: round
Cystic LCH: - LAM ... : round cysts, evenly ... Diagnosis #Radiology #CTChest ... #Cystic #Cysts
Low Attenuation pattern (2) 
1. Centrilobular emphysema: low attenuation areas without walls. Notice the centrilobular artery
multiple thick walled cysts ... Lymphangiomyomatosis (LAM ... ): regular cysts ... Radiology #HRCT #CTChest
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
between cavities and cysts ... Cysts occur without ... Cysts usually contain ... Diagnosis #Radiology #CTChest ... #Cavity #Cyst #
Algorithm for Diagnosis of Diffuse Cystic Lung Disease (DCLD)
Round, smooth cysts with normal lung parenchyma in
Round, smooth cysts ... distribution - LAM ... Bizarre/irregular cysts ... - PLCH Round cysts ... /FB, LCDD, SS Cyst
Pericardial cyst
Pericardial cysts are connected to the pericardium and usually contain clear fluid.
The majority of pericardial
Pericardial cyst ... Pericardial cysts ... of pericardial cysts ... however there is a cyst ... #Pericardial #Cyst
There is a hydropneumothorax.
Notice the air-fluid level (blue arrow).
The upper lobe is still attached to the
attached to the chest ... There is a lung cyst ... LAM is a rare lung ... leading to pulmonary cyst ... LAM also occurs
Causes of Ovarian Mass - Differential Diagnosis Algorithm
Hyperplastic:
 • Polycystic ovary
 • Endometrioid cyst
Functional:
 • Follicular
Differential Diagnosis Algorithm ... • Endometrioid cyst ... • Follicular cyst ... Corpus lutein cyst ... • Theca lutein cyst