Cavum septi pellucidi and cavum vergae

1050 CT scans of patients under 15 years were reviewed. We also investigated the clinical features of these cases and made an attempt to disclose the incidence of cavum septi pellucidi (CSP) and cavum Vergae (CV) on the CT scan and to clarify their clinical significance. As a whole, CSP was demonstrated in 23 patients (2.2%), CV in 4 (o.4%), and both CSP and CV at the same time in 31 (3.0%). The incidence of CSP and CV in each age bracket decreased with an advance in age. No sexual differences were found. The incidences of CSP and CV in the patients with convulsive disorders, developmental delay, and other disorders were 6.4%, 5.1%, and 5.2% respectively. Of 64 patients with febrile convulsion, 4 had both CSP and CV at the same time, while one had only CSP. The four patients with both CSP and CV had convulsions three or more times, while the patient with only CSP had only one. These results suggested that those patients with febrile convulsions who had both CSP and CV at the same time were liable to have recurrent convulsions. Of 32 patients with benign infantile convulsions, only one had both CSP and CV. On the other hand, of 29 patients with infantile spasms, 2 had only CSP, and another 2 had both CSP and CV. Some patients with infantile spasms had CT scans demonstrating cerebral atrophy, porencephaly, cerebral angioma, and calcification in the brain, suggesting various types of etiology. Of 187 patients with other convulsive disorders, 4 had only CSP and 6 had both CSP and CV. Of 468 patients with developmental delay, 13 had only CSP (2.8%), one had only CV (0.2%), and 10 had both (2.1%). Of these 24 patients with developmental delay who had CSP and/or CV, 14 had cerebral atrophy besides, suggesting other etiological factors. Of 270 patients with other disorders, 3 had only CSP (1.1%), other 3 had only CV (1.1%), and 8 had both (3.0%). (J.P.N.)