[Sonographic diagnosis and follow-up study of a congenital brain tumor].

In a newborn with neurologic abnormalities a congenital brain tumor was found by gray scale sonography. By its dense structures the tumor could easily be separated from the surrounding healthy brain. Development of hydrocephalus and cystic degeneration of both hemispheres was observed by serial ultrasonography studies, which were in accordance with computerized tomography and post mortem examination.