Both primary and metastatic malignancies of the masseter muscle are ra
re. We report a case of metastatic renal cell carcinoma to the massete
r muscle. It was incidentally found as a hypervascular mass in carotid
angiography for delineating a recurrent metastatic brain tumour. Prio
r to surgical removal, intravascular embolization via the left facial
artery was performed in order to decrease intra-operative bleeding. Th
e tumour was removed with minimum damage to the muscle fibres by the e
xtraoral method, followed by a transient lower lip palsy. Metastatic i
ntramuscular tumours, which are assumed to be due to haematogenous spr
ead, are generally a sign of poor prognosis.