Fig. 4From: Clinical evaluation of photodynamic therapy for oral leukoplakia: a retrospective study of 50 patientsHistopathological examination and DNA ploidy analysis in the patient with non-dysplastic lesion before treatment. (a) The pathological changes of OLK before topical PDT were analyzed by HE staining (×100). Scale bar: 50 μm. (b-e) Brush biopsy with DNA-image cytometry, exfoliated cells taken from the palate of a 53-year-old female subjectBack to article page