Neuropsychiatric studies of the "pellucidumsyndrom".

Twenty-nine cases with the cavum septi pellucidi were examined by the brain X-ray CT comparing with the reported cases of "Pellucidumsyndrom" in the previous literatures. As to the clinical diagnoses of the 29 cases with the cavum septi pellucidi, there is no specificity of the clinical disorder in relation to the cavum septi pellucidi. But one case had an extremely large cavum septi pellucidi showing various types of mental and neurological symptoms similar to the "Pellucidumsyndrom" described by Wilder. It is suggested that the extremely large cavum septi pellucidi of the present case may produce the neuropsychiatric symptoms according to the direct action to the neighboring regions of the cerebrum.