[Image diagnosis in primary retroperitoneal tumors]

We present our experience in the diagnosis-through-image with 25 primitive retroperitoneal tumours over a period of 17 years. The histological type most frequently found was that derived from mesodermal tissue (64%). Abdominal pain and mass were the typical symptoms of the presentation. The paper analyzes the radiological studies used (except NMR) with regard to the diagnostic value they have in this sort of pathology. UIV continues to be the initial examination when a retroperitoneal tumour is suspected, obtaining a diagnostic orientation of 70%. The remaining diagnostic techniques (except arteriography and CAT) should be used as a diagnostic supplement or to assess the disease progression, unless the initial clinical symptoms make their use advisable, since the diagnostic orientation provided is usually below 50%. The use of CAT together with monitored aspiratory puncture provided a diagnostic reliability over 90%, so we conclude this should be the examination technique of choice when retroperitoneal tumour is suspected.