HRCT findings in Langerhans cell histiocytosis:
Early stage:
- Small irregular or stellate nodules in centrilobular location.
Late stage (more commonly seen)
- Cystic airspaces Cysts have bizarre shapes, they may coalesce and than become larger.
- Upper and mid lobe predominance.
- Recurrent pneumothorax.
On the left early stage Langerhans cell histiocytosis with small nodules. 
There are no cysts visible. #Clinical #Radiology #CTChest #LCH #LangerhansCellHistiocytosis #Early #Histiocytosis #RadiologyAssistant