[Non-functioning retroperitoneal paraganglioma].

Extra-adrenal pheochromocytoma or paraganglioma are rare, usually benign tumours, which clinical behaviour varies in function of whether they are able to secrete vasopressor hormones. The case of a 66 year-old male with non-functional retroperitoneal paraganglioma (chemodectoma) accidentally found with an echography is presented here. The paper analyzes the most relevant features from a pathological, clinical, evolutive, diagnostic and therapeutic point of view.