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Patient's face, frontal view. The patient developed postparalysis facial palsy following vestibular schwannoma resection several years prior. On the right side of the patient's face, the location of the right depressor anguli oris (DAO) muscle is outlined in marker on the skin. The patient attempts 3 smiles. Next, 1 mL of lidocaine, 1%, is injected into the right DAO muscle. The patient then attempts 3 more smiles, with clear improved elevation of the right oral commissure and more dental show on the right side.
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