A Case of Thyroid-like Low Grade Nasopharyngeal Papillary Adenocarcinoma

Thyroid-like low grade nasopharyngeal papillary adenocarcinoma (TL-LGNPPA) is an extremely rare adenocarcinoma that arises in the posterior nasal septum or the nasopharynx, with histological findings similar to those of papillary thyroid carcinoma; the tumor shows positive immunohistochemistry for thyroid transcription factor-1 (TTF-1) but negative results for thyroglobulin. We performed endoscopic removal of a nasal tumor under general anesthesia in a pregnant woman, and the histopathological diagnosis was TL-LGNPPA.