▁invas ive . ▁The ▁most ▁common ▁sites ▁for ▁met ast asis ▁are ▁the ▁l ym ph ▁nodes ▁and ▁the ▁l ungs , ▁but ▁can ▁also ▁include ▁other ▁org ans . ▁ ▁Sign s ▁and ▁sympt oms ▁Sign s ▁vary ▁but ▁may ▁include ▁ble eding ▁from ▁the ▁nose , ▁nas al ▁dis charge , ▁fa cial ▁de form ity ▁from ▁b one ▁er os ion ▁and ▁tum or ▁growth , ▁s ne ez ing , ▁or ▁difficulty ▁breath ing . ▁ ▁Di agn osis ▁Standard ▁X - ray s ▁are ▁still ▁acceptable ▁and ▁readily ▁accessible ▁imag ing ▁tools ▁but ▁their ▁resolution ▁and ▁level ▁of ▁an atom ical ▁detail ▁are ▁not ▁as ▁good ▁as ▁for ▁computed ▁tom ography ▁( CT ) ▁scan . ▁ ▁In ▁order ▁to ▁definit ively ▁confirm ▁cancer ▁in ▁the ▁nas al ▁cav ity , ▁a ▁t issue ▁bi ops y ▁should ▁be ▁obtained . ▁ ▁Tre at ment ▁Rad iation ▁ther apy ▁has ▁become ▁the ▁preferred ▁treatment . ▁Its ▁advantage ▁is ▁that ▁it ▁tre ats ▁the ▁entire ▁nas al ▁cav ity ▁together ▁with ▁the ▁affected ▁b one ▁and ▁has ▁shown ▁the ▁greatest ▁improvement ▁in ▁surv ival . ▁The ▁radiation ▁ther apy ▁is ▁typically ▁delivered ▁in ▁ 1 0 - 1 8 ▁treatment ▁sessions ▁over ▁the ▁course ▁of ▁ 2 – 4 ▁weeks . ▁ ▁Rad iation ▁ther apy ▁has ▁a ▁mult itude ▁of ▁accomp any ing ▁side ▁effects ▁and ▁should ▁be ▁recommended ▁on ▁a ▁case - by - case ▁basis . ▁ ▁D ogs ▁in ▁which ▁nose ▁ble eds ▁are ▁observed