Central giant cell lesions of the mandible and maxilla: a clinicopathologic and cytometric study.

Computer-assisted image analysis was used to measure four histopathologic parameters (number of giant cells, mean number of nuclei per giant cell, fractional surface area, and relative size index) in two groups of patients with central giant cell lesions in a search for possible histologic predictors of clinical behavior. The lesions of 22 patients were classified clinically into nonaggressive and the lesions of 10 patients were classified into aggressive categories in accordance with the method of Chuong and Kaban. The majority of patients with aggressive lesions had recurrent tumors within 2 years and/or experienced pain, root resorption, and cortical perforation. Giant cells were selected in 25 random high-power magnification (X400) fields and measured by means of the Leitz Texture Analysis System-Plus. Linear stepwise discriminant analysis was applied to each parameter studied. Clinically aggressive giant cell lesions were characterized by a higher number of giant cells and greater fractional surface area when compared with the nonaggressive tumors. With the use of the "jackknife" classification procedure, the accuracy of the two statistically significant parameters (number of giant cells and fractional surface area) in predicting the aggressiveness or the nonaggressiveness of our group of central giant cell granulomas was, respectively, 70% and 82%. This study provides further evidence that the use of cytometric analysis of giant cells may be helpful in predicting prognosis and in planning treatment for these often difficult-to-manage lesions.