From the expert's office: localized neural lesions following tonsillectomy.

Due to various reasons, localized neural lesions following tonsillectomy are presumably an under-reported complication in the literature. This study was undertaken to compile our experiences including a literature review to disseminate useful insights in the etiology and prognosis of this rare entity. A retrospective chart review of expert reports written by at least one of the authors for malpractice claims in relation to tonsillectomy was undertaken. Additionally, a retrospective analysis of 648 patient documents that had undergone tonsillectomy in 2001 at our institution and a comprehensive literature review were performed. The research was restricted to the item "localized neural lesion". Seven cases from the expert's offices, one of our patients who had undergone tonsillectomy at our institution and 122 cases from the literature matched our search criteria. Including our own cases, the glossopharyngeal nerve was affected in 82 patients. Other lesions encompassed injury of the hypoglossal nerve as solitary (15) or combined (5) lesion, recurrent nerve paralysis with (2) or without additional nerve lesions (7), facial nerve paralysis (10) in combination with other nerve lesions (1), and a lingual nerve deficiency as solitary (4) or combined lesion (9). A single report existed for lesion of the phrenic nerve. There were five reported cases with blindness and nine cases with Horner's syndrome. Albeit rare, localized neural lesions may occur as a troublesome complication following tonsillectomy and/or means to achieve hemostasis. Some of these cases may not result from the dissection itself but injection procedures. Surgical dissection should include careful mouth gag insertion and meticulous dissection to minimize the risk of localized neural complications. A long-term follow-up is recommended for patients with dysgeusia related to glossopharyngeal nerve injury and patients with recurrent nerve dysfunction. Other lesions are much less likely to resolve in the long-term. Localized neural lesions should adequately be included in the informed consent for tonsillectomy as well as for surgical treatment of post-tonsillectomy hemorrhage.