case_images: PMC10380942_01
case_images: CT images of a patient with an OB in the left nasal cavity. (A) Coronal CT showing swelling blocking the left nasal cavity and originating from the inferior turbinate bone, with clearly defined bone between the mass and the surrounding sinus area. Blue dotted line: boundary of the mass. Blue asterisk: left inferior turbinate. Blue arrow: possible growth direction of the mass. (B) Axial CT showing a large and well-circumscribed mass compressing adjacent structures such as the left inferior turbinate and maxillary sinus.
case_images: fonc-13-1168777-g001.jpg
case_images: PMC10380942_01_fonc-13-1168777-g001.jpg
case_images: f1
case_images: Subsequently, a CT scan of the paranasal sinuses was performed (see  Figure 1 ) and showed a localized area of dilated low-density bone destruction in the left maxilla near the maxillary sinus and nasal tract, with a size of approximately 5.1 cm * 3.1 cm * 2.4 cm.
case_images: (A) Intraoperative nasal endoscopy revealed a soft mass with gravel-like changes in the left nasal cavity, which bled heavily when touched, blurring the surgical field. (B) After the mass was removed, the enlarged maxillary sinus opening was visible under the nasal endoscope, and the middle turbinate and the medial wall of the maxillary sinus were not invaded by the mass.
case_images: fonc-13-1168777-g002.jpg
case_images: PMC10380942_01_fonc-13-1168777-g002.jpg
case_images: f2
case_images: During the operation, we found that the mass ( Figure 2 ) was soft and "gravel-like", and it was difficult to completely remove and clean up.
case_images: Image of the left nasal mass gross specimen and tissue. (A) Total volume of tumor removed during surgery. (B) High magnification view of histologic image demonstrating massive irregularly calcified bone-like tissues, proliferated fibers and blood vessels, as well as osteoblasts around the trabecular bone (hematoxylin-eosin, original magnification 100x).
case_images: fonc-13-1168777-g003.jpg
case_images: PMC10380942_01_fonc-13-1168777-g003.jpg
case_images: f3
case_images: The postoperative pathological findings ( Figure 3 ) showed that the mass consisted of a large amount of irregularly calcified bone-like tissue, proliferating fibers and blood vessels, and osteoblasts were seen around the bone trabeculae.