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Hilar enlargement
The table summarizes the causes of hilar enlargement.
Normal hili are:
- Normal in position - left
Hilar enlargement ... the causes of hilar ... HilarEnlargement #Hilar ... Unilateral #Bilateral #RadiologyAssistant
Hilar and mediastinal lymphadenopathy
In sarcoidosis the common pattern is right paratracheal and bilateral hilar adenopathy ('1-2-3-sign').
In
Hilar and mediastinal ... and bilateral hilar ... #Differential #RadiologyAssistant
Hidden areas - There are some areas that need special attention, because pathology in these areas
apical zones - hilar ... #Areas #Zones #RadiologyAssistant
Sarcoidosis
On a CXR sarcoidosis usually first presents with hilar and mediastinal lymphadenopathy (example).
Parenchymal disease can present
presents with hilar ... #Sarcoidosis #RadiologyAssistant
Once you know how the normal hilar structures look like on a lateral view, it is
how the normal hilar ... PA-view there is hilar ... Lymphadenopathy #RadiologyAssistant
Differential diagnosis of Lymphangitic Carcinomatosis. 
On the left multiple diseases showing septal thickening:
1. Lymphangitic carcinomatosis: irregular
carcinomatosis with hilar ... Comparison #Table #RadiologyAssistant
Enlargement of the hili is usually due to lymphadenopathy or enlarged vessels.
In this case there is
is an enlarged hilar ... ParatrachealStripe #RadiologyAssistant
Reticular pattern 
1. Lymphangitic carcinomatosis: irregular septal thickening, usually focal or unilateral 50% adenopathy', known carcinoma.
2.
carcinomatosis with hilar ... Comparison #Table #RadiologyAssistant
Key findings in Lymphangiomyomatosis:
Numerous thin-walled cysts, surrounded by normal parenchyma.
Cysts range from 2mm to 5cm in
Mediastinal or hilar ... #LAM #Cystic #RadiologyAssistant
Artery-to-bronchus ratio 
Normally the vessels in the upper lobes are smaller than the accompanying bronchus with
artery-to-bronchus ratio at hilar ... #Engorgement #RadiologyAssistant