[Malignant carotid paraganglioma. A case report].

The most common sites of paragangliomas occurring in the head and neck region are the carotid body and vagal glomus. The clinical course of carotid body paragangliomas is characterized by two modes of development: locoregional growth and distant metastatic dissemination. Few cases of malignant carotid body paraganglioma have been reported in the literature. We report a case managed in the ENT Department of Grenoble university hospital in 1993. A 53-year-old woman presented a bilateral functional (dopamine secretion) carotid tumor, stage II on the right side and stage I on the left side according to the Shamblin classification. Two successive excisions with complete resection were performed without complication. Two years after the second surgical excision, bone and liver metastases were diagnosed and visualized with a Ostreoscan scintigraphy. Clinical course was rapidly unfavorable and the patient died a few weeks later. Malignant forms of carotid paraganglioma are very uncommon and there is no cellular or histological appearance significantly contributing to the diagnosis of malignancy. Clinical findings are the most reliable criteria for malignancy, with the development of distant metastases usually after about 9 years. Long follow-up is essential. Histology in needed to establish the diagnosis of metastasis. A histology specimen may not be possible for a functional paraganglioma. In this case scintigraphy can provide the diagnosis. Malignant forms are more frequent in case of functional paraganglioma, more particularly in case of dopamine secretion.