Objective: To investigate the MRI features of lateral ventricular astrocytoma, and their relationship to the circumventricular organs. Methods: The MRI features were retrospectively analyzed in 14 cases of astrocytoma in lateral ventricle proved by operation and pathology. Nonenhanced and contrast enhanced MRI scanning were done in all cases, including 8 males and 6 females. The patient’s age ranged from 13~62 years old with average age of 26 years old. Result: One case (1/14） as pilocytic astrocytoma; 7 cases (7/14) were of WHO grade Ⅱastrocytoma, 4 cases (4/14) were of WHO grade Ⅲ astrocytoma, 2 cases(2/14) were of WHO grade Ⅳ astrocytoma. In 11 cases, MRI appearance agree with the operations: 2 cases arised from the septum pellucidum, 3 cases situated near the foramen of Monro, 2 cases had obscure boundary with the corpus callosum, and 4 cases had obscure boundary with the thalamus. Conclusion: Base on tumor’s location, patient’s age, and their MRI appearance, it is possible to improve the diagnostic accuracy of lateral ventricular astrocytoma.