Retroperitoneal non functional paraganglioma.

Non functional retroperitoneal paragangliomas are rare tumors: less than 50 cases are reported in the literature. They are usually asymptomatic and ca n attain big dimensions. The authors report a case diagnosed by histologica l examination of the operative specimen. Malignant tumors more frequent tha n the benign tumors present with a regional extension and delayed metastase s. The treatment is completed by surgical excision. Radiotherapy and chemot herapy can be used for palliation of symptoms.