True about Carotid body tumour is all except

Usually benign & unifocal Nonhereditary Manifested as a nonpainful mass at the carotid bifurcation Characteristic lyre sign on carotid aeriography Highly vascular nature- biopsy is contraindicated. Preoperative embolization is performed for tumours larger than 3 cm. The term first-bite syndrome was coined to describe the phenomenon of pain with the initiation of mastication; it is believed to be caused by removal of the sympathetic nerves surrounding the carotid bifurcation and reinnervation of the parotid secretory glands by parasympathetic fibers Ref : ENT textbook by Dhingra 6th edition Pgno : 392,393