Oral leukoplakia: Transmission electron microscopic correlation with clinical types and light microscopy.

Background: Leukoplakia, is a precancerous lesion that is most commonly encountered in the oral cavity. The grade of dysplasia is presumed to be the most important indicator of malignant potential. There are many promising aspects in advanced methods for the evaluation of oral precancer and cancer.

Hand-Schüller-Christian disease.

Langerhan cell histiocytosis, formerly known as histiocytosis X, traditionally denotes a group of diseases that stem from proliferative reticuloendothelial disturbances.The etiology and pathogenesis of the disease remain debatable. In this paper we report a case of Langerhan cell histiocytosis in a 3 1/2 -year-old child who reported to the department of oral pathology with gingival enlargements.