[Usefulness of ultrasonography and transcranial Doppler flowmetry in evaluation of infantile bacterial meningitis].

A 40-day-old girl with B-group streptococcal meningitis was examined with ultrasonography (US) and transcranial Doppler flowmeter. Transfontanelle US with a 7.5 MHz probe showed a dilatation of the extracerebral space (ECS). The flow velocity in the middle cerebral artery increased remarkably in the acute phase, and thereafter returned to normal. The superficial arterial velocity on the left side could not be recorded in the period of fluid collection in the left ECS. These two methods are useful procedures in the evaluation of infantile bacterial meningitis and its complications.