A case is presented of a patient undergoing pre-operative embolization
of a glomus tumour who developed a facial palsy one hour after emboli
zation. At the time of surgery it was found to be due to the embolizat
ion material (polyvinyl alcohol foam) blocking the stylomastoid artery
. The blood supply of glomus tumours and the variations in the blood s
upply of the facial nerve are discussed.