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Clinical stages of progression of lymphadenitis from NTM, Penn’s Classification (from Penn et al., 2011 61, mod.).
| Stage I | Painless, firm |
| Adherent to over lying skin Increased vasculary | |
| Stage II | Fluctuance |
| Stage III | Skin changes – violaceous coloration |
| Thinning of skin, parchment-like changes, shiny appearance | |
| Stage IV | Fistulization |
