Echoencephalographic data on the ventricular system in 66 patients during the acute period of cerebral concussion are reported. Forty-seven of them showed statistically significant signs of mild intracranial hypertension. Fourteen out of 31 subjects who had a repeated examination prior to discharge from the hospital displayed no improvement in their echoencephalographic parameters. The results obtained have important implications in assessing the duration of inpatient and outpatient treatment, in establishing the cause-and-effect relationship between the morbid state and a given trauma, and in preventing both prolonged temporary disability and general incapacity.