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[Clinical evaluation on the growth rate of recurrent odontogenic keratocysts].

PURPOSE
To evaluate the growth rate and early imaging features of recurrent odontogenic keratocysts.


METHODS
Three cases with 8 recurrent odontogenic keratocysts were selected to evaluate the growth rate of the lesions via measurement of the greatest diameter of cysts on the radiograms taken in several follow-up periods. In addition, the early imaging features of recurrent cysts were also analyzed.


RESULTS
The growth rate of 8 recurrent cysts was 0.7 mm to 22.0 mm/year with average of 4.90 mm per year. Moreover, the growth rate of recurrent cysts in early postoperative period was much faster than those in late period, and no sclerotic margin was observed around the radiolucency areas. In addition, small separated recurrences might fuse with each other and generate multilocular cyst when they were enlarged.


CONCLUSIONS
The growth rate of recurrent cysts is intensely associated with their recurrent periods, and the early separated recurrences might fuse with each other and generate multilocular cyst when they were enlarged.