Classification of LCH in adults
| Subtype . | Definition . |
|---|---|
| Unifocal | Solitary lesion involving any organ |
| Single-system pulmonary | Isolated lung involvement (predominantly smoking related) |
| Single-system multifocal | >1 lesion involving any organ |
| Multisystem | ≥2 organ/system involvement |
| Subtype . | Definition . |
|---|---|
| Unifocal | Solitary lesion involving any organ |
| Single-system pulmonary | Isolated lung involvement (predominantly smoking related) |
| Single-system multifocal | >1 lesion involving any organ |
| Multisystem | ≥2 organ/system involvement |