Study of the vascular pattern in oral lichen planus.

Oral Lichen Planus is a relatively frequent disease. Its etiopathogenesis is still unknown and it can undergo malignant transformation during its evolution. Thus, data which could contribute to the knowledge of the biology of this disease are particularly significant. The present study involves a quantitative evaluation of the vascular pattern of oral lichen planus. A portion of biopsy specimens taken for histopathologic diagnosis was processed to mark vascular walls using the histoenzymic technique for ATPase activity demonstration. Stained Sections were then evaluated in a semi-automatic magnetic image analyser. The stereologic parameters studied, showed there is no vascular increase in lichen with regard to normal mucosae or leukoplakias, since the number of vascular walls did not show significant differences. Instead, a significant increase was observed in the vascular area. The association of these parameters, indicates that lichen is a more congestive lesion than the other two conditions studied. These findings indicate that the modifications of the vascular pattern could play a role in the etiopathogenesis of oral lichen planus and suggest that the observation of these changes could be a useful element in the histopathologic diagnosis.