Question:   A 64 year old male is referred to your clinic for a mass at the left mandibular angle.  The patient reports that it has been there for years but seems to have grown more rapidly over the last three months.  He also recalls at least two times that his cheek became swollen and red, and subsequently resolved with oral antibiotics.  He has a 40 pack year smoking history but no other major medical problems.  You obtain a fine needle aspiration biopsy of the mass that reveals oncocytes.  What is your leading differential diagnosis? [Answer will be posted with next week's new question]

Answer to last week's question, Closing the Hole (May 4, 2015): 

Posterior septal branch of the sphenopalatine artery.