Sinonasal undifferentiated carcinoma originating from inverted papilloma: A case report

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Sinonasal inverted papilloma (IP) is a locally aggressive tumor found in the schneiderian membrane, lining the nasal cavity and paranasal sinuses.

Patient concerns:

We report a case of a 63-year-old woman with undifferentiated carcinoma (UC) arising in an IP in the left maxillary sinus.


The preoperative diagnosis was IP of the maxillary sinus.


We performed endoscopic medial maxillectomy to remove the remnant mass in the left maxillary sinus.


Histological examination of the specimen revealed typical area of IP and sinonasal UC.


Clinicians should consider sinonasal UC in the differential diagnosis of malignancy arising in the sinonasal IP.

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