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[Surgical approaches of the trigonoseptal region].

Surgical approaches to the trigone and septum are described with the help of dissections of anatomical specimens under operative conditions and using a microscope: the anterior frontal approach which gives access to the anterior pillars and to the body of the trigone; the ventricular junction route which provides an approach to the body of the trigone and to the hippocampal commissure; the anterior transcallosal approach.