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RMS: IRSG and SIOP classification, extended with new variants [12]
| Group | Prognosis | Subtype |
|---|---|---|
| I | Better prognosis | Embryonal RMS, botryoid type |
| Embryonal RMS, spindle-cell type | ||
| II | Intermediate prognosis | Embryonal RMS (remaining) |
| III | Worse prognosis | Alveolar RMS |
| IV | Unclear prognosis | RMS with rhabdoid features |
| Embryonal RMS with diffuse anaplasia | ||
| Sclerosing RMS |
