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reported these symptoms, neither his anesthesiologist nor his dentist recognized the evolving problem, and both concluded that intraoral manipulation had likely caused mucosal injury, leading to viral ulceration. However, a small hard mass or bony sequestrum began to protrude from the ulcerated mucosal surfaces and exfoliated from the mucosa in 2 pieces several days later ( Figure 2 ). Similar sequestra appeared and exfoliated from the ulcerated mucosal lesions bilaterally. An ear, nose, and throat consultant evaluated the patient for salivary stones but concluded that

sequestrum (3 patients), and other including duplicated surgery (4 patients). No TPs were used throughout the study. Preoperative examination was performed to exclude patients with any obvious oral and/or nasal infections. All patients included in the study presented appropriately nil per os on the day of surgery. Intraoperative monitors, including electrocardiogram, pulse oximetry, and noninvasive blood pressure cuff, were placed once the patients were appropriately positioned on the operating table. Ringer's acetate solution with 1% glucose was infused