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Introduction. Spontaneous perirenal hemorrhage or Wunderlich syndrome represents a rare entity in urological settings. The vast majority of the causes are represented by angiomyolipoma and renal cell carcinoma. In other cases, vascular abnormalities, polycystic kidneys, polyarthritis nodosa, or pyelonephritis could represent the cause of perirenal bleeding. The treatment depends on the clinical parameters at the presentation as well as on the possible presence of renal malignancies. Our goal was to present a rare case of a healthy men who presented the idiopathic Wunderlich syndrome. Case outline. We present a case of a 50-year-old patient with spontaneous perirenal hemorrhage that was not due to any defined cause even after a six-months follow-up. Conclusion. In some rare cases of perirenal bleeding, the cause cannot be defined at the presentation, even with today’s advanced radiological imaging methods. Thus, it is important to be aware of the fact that in those cases, a longer follow-up is needed, knowing that the presence of perirenal hematoma can always obscure the real diagnosis. Sometimes, even in cases where the proper follow-up has been done, the real cause of the bleeding remains unknown.