| Type 1 | Type 2 |
| Most common (90% of cases) | Less common (10% of cases) |
| The ureter crosses at the height of the third lumbar vertebra | The ureter crosses at the level of the renal pelvis |
| Deformity in the form of fish hook or “S” | Sickle-shaped deformity |
| Marked hydronephrosis | Minimal hydronephrosis |