Objective: To explore the effect of morphological changes in the development of condyloma acuminatum (CA) Materials and Methods: Lesions in five patients with CA were observed . Results: Upon electron microscopy, the most characteristic feature of the lesions important for diagnosis, was the presence of distinct perinuclear vacuolizations, or so-called koilocytes, among some epithelial cells. These cells possessed hyperchromatic nuclei, swollen mitochondria, dilated endoplasmic reticulum and dissolved glycogen. There were interchromatin granules and perichromatin granules in some nuclei. Moreover some virus particles were also seen in the nuclei of some infected cells. Conclusions: The ultrastructural findings may be used to histopathologically explain the pathogenesis and mechanism of this disease, and it is helpful for diagnosis of CA .
