Incorporation of differentiated dysplasia improves prediction of oral leukoplakia at increased risk of malignant progression.

Oral leukoplakia is the most common oral potentially malignant disorder with a malignant transformation rate into oral squamous cell carcinoma of 1-3% annually. The presence and grade of World Health Organization defined dysplasia is an important histological marker to assess the risk for malignant transformation, but is not sufficiently accurate to personalize treatment and surveillance. Differentiated dysplasia, known from differentiated vulvar intraepithelial neoplasia, is hitherto not used in oral dysplasia grading.

Proliferative verrucous leukoplakia; a critical appraisal of the diagnostic criteria.

Since its introduction in the literature in 1985, the term proliferative verrucous leukoplakia (PVL) has been the subject of an ongoing discussion with regard to its definition. Widespread or multifocal occurrence of oral leukoplakia is not just synonymous to PVL. In the present treatise the proposal is made to require the involvement of more than two oral oral subsites, a total added seizeof the leukoplakic areas of at least 3 centimeters, and a well documented period of at least five years of disease evolution being characterized by spreading and the occurrence of one or more recurrences in a previously treated area.

Primary Ewing sarcoma of the anterior mandible localized to the midline.

Ewing sarcoma is a malignant, small, round blue-cell tumor of the bone that is usually located in the long bones and the pelvis. Fewer than 3% of all Ewing sarcomas originate in the head and neck region and these are mostly located in the posterior mandible. We report the case of a 17-year-old girl with a primary Ewing sarcoma localized at the midline of the anterior mandible.

The relevance of uniform reporting in oral leukoplakia: definition, certainty factor and staging based on experience with 275 patients.

The aim of the present study was to evaluate the definition of oral leukoplakia, proposed by the WHO in 2005 and taking into account a previously reported classification and staging system, including the use of a Certainty factor of four levels with which the diagnosis of leukoplakia can be established. In the period 1997-2012 a hospital-based population of 275 consecutive patients with a provisional diagnosis of oral leukoplakia has been examined. In only 176 patients of these 275 patients a firm diagnosis of leukoplakia has been established based on strict clinicopathological criteria.