Wunderlich syndrome (WS) is defined as a rare spontaneous renal hemorrhage. It mostly occurs with concomitant diseases without trauma. It usually presents with the Lenk triad and is diagnosed in emergency departments with the effective use of advanced imaging modalities such as ultrasonography, computerized tomography, or magnetic resonance imaging scanning. In the management of WS, conservative treatment, interventional radiology, or surgical procedures are decided according to the patient's condition and treated appropriately. Conservative follow-up and treatment should be considered in patients whose diagnosis is stable. If diagnosed late, the progression can be life-threatening. As an interesting case of WS, a 19-year-old patient was presented with hydronephrosis due to ure-teropelvic junction obstruction. Spontaneous renal hemorrhage without a history of trauma is presented. The patient, who presented to the emergency department with the sudden onset of flank pain, vomiting, and macroscopic hematuria was imaged by computed tomography. The patient could be followed and treated conservatively for the first 3 days, and on the 4th day, his general condition deteriorated, and he underwent selective angioembolization and then laparoscopic nephrectomy. WS is a serious, life-threatening emer-gency, even in young patients with benign conditions. Early diagnosis is mandatory. Delays in diagnosis and non-energetic approaches can lead to life-threatening situations. In hemodynamically unstable non-malignant cases, the decision for immediate treatment, such as angioembolization and surgery, should be taken without hesitation.