Sinonasal undifferentiated carcinoma originating from inverted papilloma: A case report

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Abstract

Rationale:

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.

Diagnoses:

The preoperative diagnosis was IP of the maxillary sinus.

Interventions:

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

Outcomes:

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

Lessons:

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

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