A Rare Malignancy of Head And Neck Region: Sinonasal Undifferentiated Carcinoma

Sinonasal undifferentiated carcinoma is a rare malignancy of the head and neck region. Its diagnosis and treatment are difficult due to its rare and aggressive tumor nature and the complex anatomy of its localization. A 70-year-old male who presented with symptoms caused by this rare tumor was reported. The patient presented with pain on the left side of the head and vision loss in the left eye for 1 month, and his endoscopic biopsy was reported as undifferentiated carcinoma. This case report aimed to discuss the diagnosis and treatment of sinonasal undifferentiated carcinoma.