Intraventricular haemorrhage complicating a brain abscess.

Intraventricular haemorrhage occurred in a patient with a parietal rim-enhancing mass on computed tomographic scan. At operation a brain abscess was identified and removed. Peptostreptococcus and fusobacterium were isolated, possibly of dental origin. The possible sources of this intracranial bleeding are discussed. A neoplasm should not always be considered in the case of a cerebral ring-enhancing mass complicated with intracranial bleeding; in selected cases, brain abscess should be excluded too.