Ha Kim Trung Educational foundation: Military Medical University Summary of new major scientific contribution of thesis: Carrying out the study on 57 patients of lateral ventricles at the Vietduc Hospital between 2011 and 8/2015, the thesis has major scientific contributions as follows: - Identification of some features of the tumors: frequency, age, sex, histology (85.6% benign), common types (meningioma, central neurocytoma, ependymoma).