Objectives: To report the case of a female patient with ultrasound diagnosis of great left retroperitoneal hematoma admitted to the hospital for diagnostic workup and treatment.
Methods: 39-year-old patient presenting with intense epigastric pain irradiated to both flanks. Hematuria was not present. CT scan and arteriography led to the diagnosis of angiomyolipoma with arteriovenous fistula and subcapsular hematoma. Selective embolization was carried out.
Conclusions: Hamartomas account for 3% of kidney tumors in adults; they are composed of 3 mesodermal tissues, including blood vessels. The lack of elastic membrane in their arteries favours aneurysm development.