Non secreting retroperitoneal paraganglioma

Paraganglioma is a rare tumor arising from indifferentiated cells of the pr imitive neural crest. These tumors are most commonly found in the adrenal g land but other localisations are possible. We described a 60-year-old men w ith a right retro-peritoneal mass discovered on ultrasound examination. Thi s tumor had an heterogeneous appearance on IV contrast injected CT (compute d tomography) and MR (magnetic resonance) images. Plasma and urinary catech olamines were normal. This tumor was surgically removed. Immunohistochemica l analyses revealed that the tumor cells were strongly positive for neurone specific enolase and chromogranin A. Histopathologic examination diagnosed a non secreting paraganglioma in the right retroperitoneum. After surgery, the patient remained asymptomatic without treatment.