In a later stage the nodules start to cavitate and become cysts. These cysts start as round structures but finally coalesce to become the typical bizarre shaped cysts of LCH. In patients with LCH 95% have a smoking history. #Clinical #Radiology #CTChest #LCH #LangerhansCellHistiocytosis #Late #Histiocytosis #Cavitary #RadiologyAssistant