A rare case of mandibular radiulin cyst lined almosily with ciliated epithelium is reported in this paper.
A 22-year old man was 1 efered lor itratment of the mandibular lesion. The patient had a long history of this lesion but he had not received the radical treatment bacause the symptoms were not so obvious. At the time of the reference, his left cheek was slightly swollen and the buccal side of 567 was moderately expanded. The crown of 6 decayed completely, but both neghboring teeth were vital. By the X-ray examination, dearly bordered radiolucent shadow located at the apial region of 6 was found, and the lesion was diagnosed as radicular cyst.
Routine surgery was carreied out. The lesion and 6 were extirpated and the wound was closed. No evidence was observed after the operation. The histopathologic findings were as follows. The cyst wall was mainly lined with ciliated epithelium and partially with non-keratinized squamous epithelium. Some Muticarmine-positive mucous cells were scattered in the epotheraial layer of the region covered with ciliated cells, and the subepithelial layer corresponding to this area was mildly infiltrated by lymphocytes and plasma cells. On the other hand, in the connective tissue under the squamous epithelial lining the infiltration of neutrophiles and round cells was severe.
About the derivation of ciliated epithelium found in the radicular cysts, especial in the mandibular lesions, some of opinions were mentioned but none of them has yet to be acepted generally. In consideration of the histopathologic figures and the other reported studies, it is most reasonable to think that ciliated epithelium found in this case was the result of metaplastic change, that is, derivated from squamous cells.
