| Stage | Description |
|---|
| I | Growth limited to the tube |
| Ia | Growth limited to one tube; no ascites |
| Ib | Growth limited to both tubes; no ascites |
| Ic | Growth limited to one or both tubes; ascites present with malignant cells in fluid |
| II | Growth involving one or both tubes with pelvic extension |
| IIa | Extension and/or metastasis to the uterus or ovary |
| IIb | Extension to other pelvic tissues |
| III | Growth involving one or both tubes with widespread intraperitoneal metastasis to the abdomen (the omentum, the small intestine and its mesentery) |
| IV | Growth involving one or both tubes with distant metastasis outside the peritoneal cavity. |
