Abstract
Perineural invasion (PNI) occurs in 2–6 % of cutaneous head and neck basal and squamous cell carcinomas. It is associated with mid-face location, recurrent tumors, high histologic grade, and increasing tumor size. Although PNI may be associated with skin cancers arising in any location, it is a particular problem for those arising in the head and neck because of the proximity of cranial nerves and the increased difficulty obtaining wide margins. Patients may be asymptomatic with PNI appreciated on histopathologic examination (incidental) or may present with cranial nerve (CN) deficits (clinical); usually CNs V and VII. Magnetic resonance imaging may be obtained to detect and define the extent of PNI; computed tomography (CT) may assist with detecting or excluding regional lymph node metastases. Patients with apparently resectable cancers undergo surgery, often followed by postoperative radiotherapy (RT). Patients with unresectable cancers are treated with definitive RT. The 5-year outcomes after treatment for incidental vs. clinical PNI are: local control, 80 % and 55 %; cause-specific survival, 75 % and 65 %; and overall survival, 55 % and 50 %, respectively. The incidence of grade ≥3 complications is higher after treatment for clinical PNI vs. microscopic (incidental) PNI; approximately 35 % compared with 15 %, respectively. Proton beam RT may be used to reduce the risk of late complications by reducing RT dose to the visual apparatus and central nervous system.
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Mendenhall, W.M., Bennett, J. (2013). Squamous and Basal Cell Carcinomas with Perineural Invasion. In: Cognetta Jr., A., Mendenhall, W. (eds) Radiation Therapy for Skin Cancer. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6986-5_18
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DOI: https://doi.org/10.1007/978-1-4614-6986-5_18
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