The bone of the paranasal sinuses which is covered by a thin mucosal wall has been thought to be frequently affected by the pathological changes of lining mucosae.
The author examined histopathological changes and thickness of the bone, taken from anterior and medial walls of 37 cases of maxillary sinus during Caldwell-Luc operation for chronic paranasal sinusitis.
The study on relations between histopathological changes of bone and mucosa and the other factors that were thought to be related to histopathological changes of the bone, such as location, age, sex, duration of illness, was performed.
The obtained results are as follows :
1. The anterior (facial) bony walls revealed abnormal histopathological changes in 75.7% of the cases and medial walls revealed in 73.0%, and the most common type was ostoclastic.
2. The anterior bony wall was thicker than the medial bony wall, but the same portion of the anterior mucosa was thinner than that of the medial wall.
3. The thickness of the bony wall was the thinnest in osteoclastic type and the thickest in osteoblastic type.
4. The mucosal pathologic change seemed to be no definite relation with the type of bony change, and usually the most frequent change of the mucosal wall was atrophic type.
5. There were no correlations between the thickness of the bone and sinus mucosa.
6. In bilateral cases, these were similar bony changes between right and left bony walls, in about 50% of the cases.
7. There were similar bony changes between anterior and medial walls in about 70.3% of the cases.
8. Osteoclastic type in the bone seemed to be gradually increased with aging.
9. There seemed to be no sexual difference in histopathiologcal changes of the bone.
10. The longer duration of illness, osteoclastic bone change seemed to be increased.
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