[Pathological analysis of metastatic brain tumors misdiagnosed with MRI].

Objective: To study the pathological basis of metastatic brain tumors misdiagnosed with (MRI).

Methods: Seven cases were analyzed histopathologically and immunohistochemically, compared with the MRI image.

Results: All the tumors were single large noduls. Hemorrhage and necrosis of the tumors were seen in all the cases. Cystformation of the tumor, glial cell proliferation and vascular proliferation of peritumoral brain tissues were seen in most cases.

Conclusion: The secondary changes of metastatic brain tumors and the reactive changes of peritumoral brain tissues are the major causes of MRI misdiagnosis.