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BACKGROUND. Squamous cell carcinoma is the second most common cutaneous malignancy in humans, affecting approximately 200,000 people in the United States each year. In immunocompromised patients, squamous cell carcinoma is the most common skin cancer, and it also tends to behave more aggressively than in immunocompetent patients. OBJECTIVE. We describe an immunocompromised patient, previously treated for a squamous cell carcinoma of the left posterior shoulder, who subsequently developed a cord-like, intraneural metastasis of the spinal accessory nerve. RESULTS. The patient presented with a 3-month history of lancinating pain of the left neck and shoulder. He had been treated previously for a squamous cell carcinoma of the left posterior shoulder, which subsequently recurred twice. On examination, a cord-like mass was palpable along the path of the spinal accessory nerve. Given the aggressive nature of this patient's squamous cell carcinoma, surgical exploration was performed. Frozen-section analysis of the spinal accessory nerve and of the multiple supraclavicular nerves revealed perineural and intraneural squamous cell carcinoma. CONCLUSION. To our knowledge, this is the first reported case of a primary cutaneous squamous cell carcinoma of the trunk or extremity metastasizing to a cranial nerve.

To our knowledge, this is the first reported case of a primary cutaneous squamous cell carcinoma of the trunk or extremity metastasizing to a cranial nerve.

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