Low-Grade Papillary Schneiderian Carcinoma in the Nasal Cavity.

Only a limited number of documented low-grade papillary Schneiderian carcinoma (LGPSC) cases have been reported since its initial description in 2015. In this study, the authors present a case report involving a young female patient who presented with this rare condition localized in the nasal cavity. On the basis of histologic examination of a small tumor sample, the initial diagnosis pointed to squamous cell carcinoma. After the surgery, however, the final histologic diagnosis was confirmed as LGPSC. Finally, after surgical intervention, the histologic diagnosis was confirmed as LGPSC. Remarkably, over a period of 22 months, the patient showed no signs of recurrence or metastasis. To achieve an accurate diagnosis and implement appropriate treatment strategies for LGPSC, a comprehensive understanding of both its clinical and histologic characteristics is necessary.