A Rare Case of Synchronous Squamous Cell Carcinoma on the Body of the Tongue and Malignant Lymphoma of the Neck

Synchronous malignancy with squamous cell carcinoma (SCC) in the head and neck occurs mainly in the aerodigestive tract, with a frequency of 60-70%. In contrast, SCC in the head and neck very rarely coincides with malignant lymphoma (ML). Here we report a case of synchronous SCC on the lower-left surface of the tongue and ML on the left –side of the neck in a 75-year-old man. The patient had consulted a local doctor for a mass on the left side of his neck. After enucleation of the neck mass, the pathological diagnosis was metastatic malignant tumor of unspecified origin. On the other hand, the tongue lesion was regarded as benign and followed-up. For further diagnosis of the lesions, the patient was transferred to our hospital in March 2015. Biopsy indicated tongue SCC. Resection of the primary tongue lesion and radical neck dissection of the left side neck were then performed. The cervical mass was diagnosed as ML, and found to be simultaneously affected by the tongue SCC and cervical ML. Approximately two years later, a follow-up CT showed recurrent ML on the left tonsil, which was treated by chemotherapy.