Langerhans cell sarcoma of the cervical lymph node: a case report and literature review.

Langerhans cell sarcoma (LCS), a neoplastic proliferation of Langerhans cells with malignant cytologic features, is a very rare disease. We report the case of a 62-year-old male with LCS arising in a cervical lymph node. Histologic examination of a biopsy specimen of the lymph node demonstrated a proliferation of Langerhans cells with malignant cytologic features. Immunohistochemically, the tumor cells were positive for S-100 protein, CD1a, and Langerin (CD207). These histomorphological findings supported the diagnosis of LCS. The patient underwent radiotherapy. Neither local recurrence nor distant metastasis was observed at 45 months after radiotherapy. Characteristic immunohistochemical findings were helpful to identify LCS, and head and neck surgeons should be aware of this rare disease entity.