Rapid evolution of a choroid plexus papilloma in an infant.

Choroid plexus papilloma (CPP) is primarily found in children less than 2 years of age but can also be diagnosed prenatally. The presentation of a large CPP during infancy is not uncommon and surgical excision is usually recommended without delays. As a result, information about the growth rate of CPP during infancy is lacking. We report a preterm infant who presented with a choroid plexus papilloma that grew from being undetected on MRI to reaching a large size in 5 months. The case is unique in that it provides documentation of the rapid growth potential of this benign tumour in infancy. A possible explanation for this occurrence is discussed.