discussion-presentation71

A paraganglioma is a tumor derived from extra-adrenal chromaffin cells of the sympathetic  paravertebral  ganglia of thorax, abdomen, and pelvis.

About 80 to 85% of chromaffin-cell tumors are pheochromocytomas,

whereas 15 to20%are paragangliomas.

The prevalence of PPGL in patients with hypertension in general outpatient clinics varies between 0.2 and 0.6%.

 Malignancy is defined as the presence of metastases in nonchromaffin tissue; the prevalence varies between 10 and 17%.