Follicular dendriti c cell tumors are extremely rare. Only 17 cases have been previously described in the literature, and only three ofthem involved prima ry tumors ofthe oral cavity. We describe a new case of the latter, which occurred in a 51-year-old man who sought evaluationfo r a painl ess enlargement of his lef t palatine tonsil. The tonsil was excised, and histologic examination revealed that the tumor was a prima ry sarcoma that had arisen fr om the dendritic reticulum cells of the palatin e tonsil. Postoperatively, the tumor site was treated with percutaneous irradiation (total dose: 70 Gy). Af ter more than 5 years of f ollow-up, the patient showed no evidence of recurrence. We also discuss the salient f eatures of the immunohistochemical examination.
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