Scanning electron microscopy
Sinonasal mucosa specimens were dehydrated with different concentrations
of graded ethanol for 10 minutes each. The dehydrated specimens were
soaked in 100% acetone for 20 minutes and then in pure isoamyl acetate
for 30 minutes. All samples were dried in a carbon dioxide critical
point dryer, then sputtered with gold, and examined by SEM (QUANTA 2000;
FEI; Czech republic) at the accelerated voltage of 10kV.