Paragangliomas of the carotid bifurcation: oncological aspects of vascular surgery.

The present study reviews in concise form the past 12 years of our clinical experience with paragangliomas of the carotid body. Every aspect of the anatomical, histological and biological and biological behaviour of paragangliomas of the carotid body has been recorded in order to be able to define better surgical management and the clinical prognosis. In addition to the conventional histological methods of investigation we also applied immunohistochemistry and made use of electron microscopy. Eighteen tumours of the carotid body in 12 female and four male patients with a mean age of 54 years (34 to 70 years) were treated surgically. Angiography of the aortic arch and supra-aortic branches was undertaken diagnostically in every case. In three patients computer tomography and magnetic resonance imaging demonstrated spreading of the tumour up to the base of the skull and pre-operative embolization of the arteries supplying the tumour was performed to decrease tumour vascularity. In four cases (22%) resection of the internal carotid artery and its reconstruction by a saphenous vein graft was required in order to achieve the therapeutic aim of a complete extirpation of tumourous tissue and preserving the vascular system of the internal carotid artery. In three cases (16%) there was histological evidence of a metastasizing process to the local lymph nodes of the neck and, due to this criterion of malignancy, 50-60 Gy of radiation was applied to the site of the tumour after surgery. Four patients experienced a transient neurological deficit in the supply area of the hypoglossal and the recurrent nerves. In one case, the vagus nerve could not be retained. In an average follow-up of 102 months we recorded one case of local recurrence 13 months after the initial resection and radiation treatment applied to a malignant paraganglioma. All the other patients were doing well without evidence of recurrent disease.