A very common benign tumor is explained. It is important to clearly differentiate the benign from the malignant.

1. OSTEOMA
VISITH DANTANARAYANA
301

2. WHAT IS AN OSTEOMA?
AN OSTEOMA IS A NEW PIECE OF BONE GROWING ON
ANOTHER PIECE OF BONE.
THEY CAN BE EITHER HOMOGENOUS OR
HETEROGENOUS.

3. OSTEOMA OF EXTERNALAUDITARY
MEATUS

4. IN RELATION TO OTHER BONE
TUMORS

5. SPECIFICITY
THEY ARE MORE OFTEN PREVALENT IN THE
PARANASAL SINUSES.

6. CLINICAL FEATURES
PARANASAL OSTEOMAS ARE USUALLY
ACCOMPANIED BY HEADACHES, FACIAL
DISTORTIONS, CSF LEAKAGE.

7. DIAGNOSIS

8. MACROSCOPIC DESCRIPTION
• SESSILE, POLYPOID SHAPE
• MEDIAN SIZE 3.0 CM (RANGE 0.5-8 CM)
• SMOOTH, BOSSELATED SURFACE
• CUT SURFACE WITH DENSE COMPACT BONE (IVORY
OSTEOMA), TRABECULAR BONE (MATURE
OSTEOMA, OR BOTH PATTERNS)

9. OSTEOMA WITH SMOOTH BOSSELATED
SURFACE.
POLYPOID CHARACTER
DENSE COMPACT BONE ON THE
CUT SURFACE WITH TRABECULA

10. MICROSCOPIC DESCRIPTION
• COMPOSED PRIMARILY OF DENSE, COMPACT BONE
AND BROAD TRABECULAE OF MATURE BONE
WITHIN PAUCICELLULAR FIBROUS STROMA
• OUTER SURFACE IS SHARPLY DEMARCATED AND
LINED BY RESPIRATORY EPITHELIUM IN SINUS
TUMORS
• AREAS RESEMBLING OSTEOBLASTOMA (NARROW,
ANASTOMOSING TRABECULAE OF WOVEN BONE
WITH OSTEOBLASTIC RIMMING WITHIN A
FIBROVASCULAR STROMA) ARE COMMON (38%)

11. AREAS RESEMBLING
OSTEOBLASTOMA

12. DENSE COMPACT BONE

13. INVASIVE LIKE TRABECULAE

14. TREATMENT

15. THANK YOU
WITH COMPLIMENTS FROM CEYLON TEA