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COG Staging System
| Stage I | Complete gross resection at diagnosis with clear margins |
| Stage II | Complete gross resection at diagnosis with microscopic residual disease at the margins of resection |
| Stage III | Biopsy only at diagnosis; or gross total resection with nodal involvement; or preoperative tumor spill/rupture; or incomplete resection with gross residual |
| Stage IV | Distant metastatic disease at diagnosis |
