Surgical approaches to the lateral ventricles. The site of the skin incision (solid line) and the bone flap (broken line) are shown for each approach. The anterior part of the lateral ventricle may be reached by the anterior transcallosal, anterior transcortical, and the frontal approaches. The posterior routes to the lateral ventricle are the posterior transcallosal, posterior transcortical, and occipital approaches. The inferior part of the lateral ventricle are reached using the frontotemporal and temporal approaches. (Images courtesy of AL Rhoton, Jr.)