Cystic Langerhans Histocytosis

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30 year old with dyspnea
- Pulmonary langerhans histocytosis (lch)
- Eosinophilic granuloma of the lung
- Pulmonary histocytosis x
- Young or middle age
- H/o cigarette smoking
- Spares lung bases Increased lung volumes
- Increased lung volumes

DDX:
Cystic LCH can resemble LAM, but no pleural effusions

Differential Diagnosis:
- Sarcoid
- Infection-fungal