Hi, understand your anxiety. The spots on the MRI could be due to tumors. Others which can cause similar pictures are cysts and sometimes hemangiomas. Again a follow up may be mandatory to see for changes in the lesion.
If there is a doubt then a biopsy may be needed. A biopsy facilitates a histologic study of cells, which gives you a definite diagnosis. So once you have the diagnosis you will know what measures or precautions you need to follow. Please follow up with your doctor. Regards.