What is the appropriate timing for endoscopic and radiographic surveillance following treatment for sinonasal malignancies?

The article focuses on the topic of sinonasal malignancies, discussing treatment with the help of using endoscopic and radiographic surveillance methods. It reports that the malignancies rare other than head and neck neoplasms and lacks post-treatment surveillance. Sinonasal malignancies also have poor prognosis and is the lead cause for mortality. It reports on the presents practices in the use of post-treatment surveillance to understand he disease.