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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