I agree.. A biopsy is necessary to know for sure. Why wait go through an MRI only to have to have it biopsied regardless? That's the only way for a firm dx... Would you let them treat him without a biopsy? Unless of course you were almost certain it was a recurrence? Would they treat him without a biopsy? And since MRI's ct's and PETs all respond to similar things, infection, healing, inflammation what does your ENT hope to gain by making you wait? Plus - how comfortable would you be waiting? To see if it grows or spreads?
Good luck... smile and hugs and do breath. It could just be an area of inflammation.

Cheryl : Irritation - 2004 BX: 6/2008 : Inflam. BX: 12/10, DX: 12/10 : SCC - LS tongue well dif. T2N1M0. 2/11 hemigloss + recon. : PND - 40 nodes - 39 clear. 3/11 - 5/11 IMRT 33 + cis x2, PEG 3/28/11 - 5/19/11 3 head, 2 chest scans - clear(fingers crossed) HPV-, No smoke, drink, or drugs, Vegan