MRI Diagnosis of Fourth Ventricular Masses / 医疗卫生装备

ABSTRACT

Objective To discuss MRI characteristics and differential diagnosis of fourth ventricular masses. Methods We retrospectively analyzed 90 cases' MRI findings of fourth ventricular masses that were proved by the surgery (n=83) or were diagnosed by more than three professors and assistant professors in the neuroradiology field (n=7). Results These masses in our study included the medulloblastomas (n=27),the ependmomas (n=18),the choroid plexus papillomas (n=11),the metastases (n=7),astrocytoma (n=6),astrocytomas and glioma (undifferentiated and mixed patten are 5cases),epidermoid cysts (n=5),cerebral cysticercosis (n=4),cavernous hemangiomas (n=4),venous malformation (n=3). Their shapes were spheroridal or irregular,and some masses could become cystic changes in the masses. Most masses could be enhanced or a few couldn't be enhanced with DPTA on MRI. Conclusion The demonstration of fourth ventricular depends on MR findings. It is important to differentiate these masses between within and without fourth ventricular for the differential diagnosis.