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. 2021 Dec 20;49(12):03000605211062445. doi: 10.1177/03000605211062445

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© The Author(s) 2021

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Figure 3. — The anatomical boundaries of the surgical field was observed.

TSFN, tympanic segment of facial nerve; BTC, basal turn of cochlea; MSFN, mastoid segment of facial nerve; JB, jugular bulb.