A case of a sinonasal undifferentiated carcinoma occurring 2 years after a successfully surgically treated intestinal-type adenocarcinoma has never been reported. Treatment modality of paranasal sinus cancer strictly depends on histology so it is important to recognize a different tumor type in the follow-up of these patients.
Keywords: Endoscopic resection; Intestinal-type adenocarcinoma; Metachronous tumor; Paranasal sinus tumor; Sinunasal undifferentiated carcinoma.
© Association of Otolaryngologists of India 2017.