Mango-shaped Bi-paddled pectoralis major myocutaneous flap reconstruction for large full-thickness defects post resection of squamous cell carcinoma of oral cavity: An analysis of 232 cases.

Objectives: The objective of the study was to examine the feasibility of bi-paddled pectoralis major myocutaneous (PMMC) flap reconstruction in patient undergoing full thickness composite resection.

Materials And Methods: Inclusion criteria: The subjects chosen were patients with clinically T4A squamous cell carcinoma of buccal mucosa, lower alveolus, and maxilla in with skin involvement. Patients required a full-thickness composite resection of intraoral lesion, bone (mandibular segment and/or maxilla), and overlying involved skin and had modified radical neck dissection. Exclusion criteria: Patients not requiring full thickness composite resection including skin. Patients were observed postoperatively for early and late postoperative complications, starting of oral feeding, post-operative trismus, and dysphagia during subsequent follow-up and cosmetic outcome.

Results: Overall, the complication rate was 33.8% out of which only 7.8% required major re-surgery with second flap reconstruction. This is comparable with other large series of PMMC flap. Clavien-Dindo Grade I complications were seen in 9.5%, Grade II in 69.7%, Grade IIIA in 13.4%, and Grade IIIB in 7.45% of patients. Full-thickness partial flap necrosis included necrosis of either the external or the internal skin paddle. There were 15 cases - 6.5% of full thickness external paddle necrosis. These were mostly in patients with bite composite resections and having a larger random fasciocutaneous distal component of the flap without underlying muscle. Furthermore, 40% of these patients were females. In females, the flap necrosis comprised 4 of the 12 patients (33.33%).

Conclusion: Pectoralis major mycocutaneous flap has been a boon to reconstruction of the oral cavity post its inception. In case of locally advanced squamous cell carcinomas of the oral cavity, in many instances, there is a clinically significant cervical lymph nodal spread vessels post mandating a comprehensive lymph node dissection. PMMC flap provides a robust well vascularized muscular cover to the cervical vessels poststernocleidomastoid excision.