PMC8025948_01
Preoperative extraoral
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F1
The left ear lobule was slightly raised and everted [Figure 1].
Preopertaive intraoral
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F2
Incisional biopsy was performed for intraoral lesion, which was suggestive of well-differentiated squamous cell carcinoma (SCC) [Figure 2].
Intraoperative facial nerve
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F3
The marginal mandibular nerve was identified from beneath the lower incision margin and retrograde tracing was performed to locate the main nerve truck, which was preserved [Figure 3].
Postoperative intact facial nerve function
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F4
Postoperative period was uneventful [Figure 4].