Carotid body tumor: diagnostic and therapeutic approach.

Carotid body tumor may be clinically suspected when the only clues are physiologic manifestations of carotid body dysfunction or when a palpable cervical mass is evident upon presentation. In the latter case, the physiologic signs of carotid body dysfunction are usually recognizable. We have presented the case of a patient who was completely disabled by a slowly enlarging carotid body tumor. An attempt at surgical excision of the tumor was unsuccessful because of its proximity and adhesion to vital neck structures. An endocardial pacemaker inserted to ameliorate the episodes of bradycardia and hypotension accompanied by transient complete atrioventricular block resulted in only partial and temporary relief. Finally, irradiation of the tumor induced fast shrinkage and rapid regression of symptoms.