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Initial morbidity was high at 1 week, but had resolved in almost all cases after 6 months.
O'Regan B, Bharadwaj G et al. Br J Oral Maxillofac Surg 2007; 45: 101–107
Traditional parotidectomy for benign tumours is currently under question. Antegrade facial nerve dissection from the trunk forwards also presents difficulties in some cases. Retrograde dissection has been suggested as a useful technique. Patients in this study included 51 with pleomorphic adenoma, 42 with sialoadenitis, and the remainder with 7 other conditions. Nerves were monitored during surgery.
At 1 week, 34% of patients were fully recovered, but 66% had some facial nerve paresis, with the degree slight in about 4/5. At 1 month, 62% were fully recovered, and at 3 months, 84%. At 6 and 12 months only one patient had a minor permanent paresis of the marginal mandibular nerve. The authors consider that the retrograde technique has several advantages for the procedure.
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Facial nerve morbidity after retrograde nerve dissection in parotid surgery for benign disease: a 10-year prospective observational study of 136 cases. Br Dent J 203, 406 (2007). https://doi.org/10.1038/bdj.2007.898