Retroperitoneal fibrosis. Coloured 3D computed tomography (CT) angiogram of the aorta in the torso of a 46-year-old patient with retroperitoneal fibrosis. Retroperitoneal fibrosis, or Ormond's disease is a disease of unknown origin that is characterised by the proliferation of fibrous tissue in the retroperitoneum, the abdominal cavity behind the peritoneum, which contains the kidneys, aorta, renal tract, and other organs.
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