JUVENILE OSSIFYING FIBROMA - AN ANALYSIS OF 33 CASES WITH EMPHASIS ON HISTOPATHOLOGICAL ASPECTS

Juvenile ossifying fibroma (JOF) is a maxillofacial fibro-osseous lesion that may show cell-rich osteoid strands or psammoma-like ossicles. Whether both types are variants of a single entity or different lesions under the same diagnostic label is a subject of debate. This problem was investigated by analyzing a series of 33 patients with lesions having one or bath of the above histological appearances. It was concluded that osteoid strands define a unique fibro-osseous lesion but that lesions with psammoma-like ossicles fall within the morphological spectrum of cemento-ossifying fibroma. Therefore the term juvenile ossifying fibroma should be reserved for the lesion with the osteoid strands

CARBON-DIOXIDE LASER-SURGERY OF ORAL LEUKOPLAKIA

Oral leukoplakia is a precancerous lesion of the oral mucosa. The risk of malignant transformation depends on the clinical and histologic classification and the location of the lesion. For a nonhomogeneous leukoplakia, this risk is 23.4% to 38.0%. In the presence of epithelial dysplasia, the possibility of malignant transformation is 36.3% to 43.0%. Leukoplakia is limited to the epithelium, so a selective removal of this part of the mucosa seems to be the best preventive treatment. Carbon dioxide laser surgery accomplishes a superficial removal by evaporation. A total of 70 patients with 103 oral leukoplakias were treated with carbon dioxide laser evaporation. This resulted in an excellent wound healing with virtually no scarring. The patients were followed up during a period of up to 12 years (mean 5.3 years), showing a cure rate of 90%

PSAMMOMATOID OSSIFYING FIBROMA OF THE PARANASAL SINUSES - AN EXTRAGNATHIC VARIANT OF CEMENTO-OSSIFYING FIBROMA - REPORT OF 3 CASES

Psammomatoid ossifying fibroma (POF) is a diagnostic designation for a sinonasal or orbital fibroosseous lesion characterized by numerous small round mineralized spherules lying in a fibroblastic stroma. We report 3 cases. One occurred in the frontal sinus of an 18-years-old male; 1 in the frontal sinus of a 20-year-old male and 1 in the maxillary sinus of a 36-year-old male. Rather limited excision resulted in a disease-free follow-up time from 2 to 6 years. The histomorphology of POF was compared with other fibro-osseous lesions of the craniofacial skeleton including the jaws. It appeared that POF is similar to cemento-ossifying fibroma occurring in the jaws and the necessity for different names for lesions only differing in their site of occurrence is considered to be at least debatable