Enbloc Resection of Primary Oral Cancer Involving Infratemporal Fossa: A Systematic "out to in and Top to Bottom" Surgical Approach and Outcomes.

Aim and introduction: The oral cavity squamous Cell Carcinoma (OCSCC) involving infratemporal fossa (ITF) is considered as cT4b stage per AJCC Sth classification. The treatment of these group of patients is challenging due to the difficulty in achieving negative resection margin status. In this study we have highlighted our surgical technique with oncological outcome of enbloc resection of primary oral cancer involving ITF. Methodology: - This was a single center retrospective study which included only patients with OCSCC extending into ITF. Our surgical technique of systematic "out to in and top to bottom" approach was detailed. The perioperative outcomes, histopathological details, survival outcomes were measured. Results: - Over the period of 1 year a total of 340 patients with OCSCC reported to our outpatient department, out of which 120 patients belonged to cT4 category and 32 patients were cT4b stage with involvement of ITF. Amongst 32 patients, 2 patients had distant metastasis and were excluded from the study. The 5 patients received neoadjuvant chemotherapy followed by surgery and rest all patients were taken up for upfront curative surgery. There were no significant intraoperative and postoperative complications. None of the margins were found to be involved or close in the final histopathology report. The median DES and OS were 31 months and 27 months respectively at a median follow up of 29 months. Conclusion: - Our systematic approach of enbloc resection of primary oral cancer involving ITF is safe and easily reproducible with high rate of negative resection margin status. (c) 2023 Elsevier Masson SAS. All rights reserved.