Spontaneous renal haemorrhage in the subcapsular and perirenal regions of non-traumatic etiology, or Wünderlich syndrome, is an uncommon but significant condition consisting in the sudden formation of an haematic collection in the renal cell. A retrospective evaluation of clinical data and radiological findings in 7 patients with spontaneous subcapsular and/or perirenal haemorrhage seen in our service between 1991 and 1995 has been conducted excluding from the study all those patients with a history of trauma, renal biopsy, anticoagulant therapy or renal failure undergoing treatment with haemodialysis or renal transplantation. The etiology of Wünderlich syndrome in our patients was heterogeneous but basically responded to a tumoral cause. CT was the method most frequently used and the one providing more information. The conservative approach appears to be the most acceptable option, unless malignant tumoral pathology can be demonstrated.