Superficial esophageal lymphoepithelioma-like carcinoma treated with endoscopic submucosal dissection: a case report.

Lymphoepithelioma-like carcinoma (LELC) of esophagus is an extremely rare tumor only a few cases were successfully treated with endoscopic submucosal dissection (ESD). We herein report one case of superficial esophageal LELC with adjacent squamous intraepithelial neoplasia successfully treated by ESD, and the status of Epstein-Barr virus (EBV) infection and microsatellite instability (MSI) were detected simultaneously. A 71-year-old woman presented with complaints of substernal discomfort. Under endoscopy, a dome-shaped bulge of 1.2 cm × 0.8 cm was located at the mucosal lamina propria in the left lateral wall of the middle esophagus, and the mucosa covering the bulge was smooth and normal-appearing. A brownish lesion was found adjacent to the bulge. Microscopically, the tumor was well demarcated, and nests of syncytial epithelioid cells were identified in the lamina propria of the mucosa, with a large number of inflammatory cells. The squamous epithelium covering the surface of the infiltrating tumor and the second brownish lesion demonstrated low grade squamous intraepithelial neoplasia. Tumor tissue showed CK5/6, p63, and p40 positive staining, was EBV negative, and had microsatellite stability. After treatment with ESD, this patient received no further treatment, and had no recurrence or metastasis at 25-month follow-up.