Neuroendocrine Carcinoma Arising in a Wound after Endoscopic Sinus Surgery for Maxillary Sinusitis

Sinonasal tumors with neuroendocrine differentiation are a rare group of neoplasms that account for only 5% of all sinonasal malignancies. Paranasal neoplasms very rarely arise postoperatively from the maxillary sinus. We encountered a case of neuroendocrine carcinoma arising in a wound after endoscopic sinus surgery for maxillary sinusitis. At the first medical examination, we tried to discriminate between maxillary tumor and postoperative recurrence of maxillary sinusitis.