Table 1: Causes of spontaneous retroperitoneal hemorrhage.
| Tumors | Vascular |
| Angiomyolipoma | Renal artery aneurysm |
| Renal cell carcinoma | Renal artery ruptura |
| Pheochromocytoma | Thrombosis |
| Myeloma | Renal infarction |
| Adenoma | Abdominal aortic aneurysm ruptura |
| Hemangioma | Aretriovenous fistula/malformation |
| Metastasis | Polyarteritis nodosa |
| Carcinoma | Behçet syndrome |
| Retroperitoneal tumors | |
| Pancreas |