Giant cystic lesion in neurofibromatosis.

In the case of an asymptomatic 10-year-old girl with neurofibromatosis type 1, a concomitant cystic brain lesion was demonstrated on cranial magnetic resonance imaging. The nature of these cysts is unknown: they may represent cellular degeneration of the lesions imaged as unidentified bright objects, cystic cortical dysplasia, or giant Virchow-Robin spaces. The novel finding in this child of coexisting unusual cystic lesion and neurofibromatosis could be coincidental; however, recent report of an asymptomatic cystic lesion in two patients with neurofibromatosis suggests otherwise.