Sinonasal osteoblastoma is an extremely rare benign bone-forming tumor.Patient concerns:
We report 2 extremely rare cases of sinonasal osteoblastoma in the middle turbinate.Diagnoses:
The preoperative diagnosis was osteoma in the middle turbinate.Interventions:
We performed endoscopic removal of the mass in the middle turbinate and frontal recess.Outcomes:
Histological examination of biopsy specimens revealed osteoblastoma.Lessons:
Clinicians should consider osteoblastoma in the differential diagnosis of tumors arising in the nasal cavities.