Patients with tumors ≥2 mm in thickness or muscle invasion developed neck metastasis, suggesting that elective neck dissection may be warranted for patients with these findings. For preoperative assessment of the need for elective neck dissection, magnetic resonance imaging would be a potential modality for T1N0 tongue cancer.

We report a case of oncocytic Schneiderian papilloma confined to the maxillary sinus and initially detected using positron emission tomography with 18F fluorodeoxyglucose FDG PET at a very early stage. A 77 year old man was based on computed tomography and magnetic resonance imaging findings, suspected of having a benign tumor, but positive FDG PET uptake suggested malignancy. The tumor was resected via a Caldwell Luc approach, and the histopathological diagnosis was oncocytic Schneiderian papilloma. Although we found FDG PET to be highly useful in detecting hidden tumorous lesions, it was not entirely so in differentiating between benign and malignant tumors.

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