Fig. 4From: Prevalence and association of Epstein-Barr virus infection with sinonasal inverted papilloma and sinonasal squamous cell carcinoma in the northeastern Thai populationEBV in sinonasal tumor tissues was detected by EBER-ISH. A positive signal (red color) was observed in infiltrating leucocytes within the tumor stroma (black arrows) but not in the tumor epithelium of the EBV DNA-positive sample group in all tumor types. No positive signal was found in the EBV DNA-negative groupBack to article page