Surgery with Post-Operative Endoscopy Improves Recurrence Detection in Sinonasal Malignancies.

The mainstay of treatment in sinonasal malignancy (SNM) is surgery, and when combined with chemoradiation therapy, often leads to the best overall prognosis. Nasal endoscopy is essential for post-treatment surveillance along with physical exam and radiologic evaluation. The ability to directly visualize the sinus cavities after surgery may also improve early detection of tumor recurrence and is another reason to potentially advocate for surgery in these patients. A retrospective chart review of medical records of patients with pathologically proven SNM was conducted from 2005 to 2019. The nasal cavity and maxillary sinus were the most common primary tumor sub-sites. The most common pathology was squamous cell carcinoma (42%). The median time to recurrence was 9.8 months. Recurrence was initially detected endoscopically in 34.3% patients, by imaging in 62.7% patients, and by physical exam in 3.0% patients. 67 (29%) total recurrences were detected on follow-up, of which 46 (68.7%) were local. Twenty-three of the local recurrences were identified via nasal endoscopy. Thirteen recurrences were identified via endoscopic surveillance within the surgically patent paranasal sinuses while 13 were identified within the nasal cavity; 5 patients had multiple sites of recurrence. Local recurrence of SNM is the most common site for recurrent disease and nasal endoscopy identified half of these cases. 50% of these recurrences were within the paranasal sinuses and would not have been easily identified if the sinuses were not open for inspection. Thus, open sinus cavities aid in the detection of tumor recurrence and is another advantage of surgery in the management of SNM.