They rarely appear as solitary lesions, more frequently, especially in children, as recurrent respiratory papillomatosis (RRP). It is characterized by multiple contiguous lesions with great propensity for local recurrences. There is a bimodal age of distribution; the first peak is before the age of 5 (juvenile form), with no gender predominance. The second peak occurs between the ages of 20-40 years (adult form) with a 3:2 male predominance {178,586,618,1282,1519}. Its true incidence and prevalence are uncertain. A wide range in incidence, 0.4-4.3 /100, 000, has been recorded for various regions worldwide {73,585,1253,1520}.

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