What Are The Symptoms And Treatment For Stroke?

My father in law (68) was referred to a neurologist by his doctor. The neurologist performed tests on him then made an appointment for an MRI a week later. He got the results back & they spotted something. The neurologist says maybe calcium deposits,tumor or possible stroke. He then sent him for CT Scans. The day they finished the scan, the called him right back in to perform another MRI with contrast as they spotted something again. It's a day later & we are patiently waiting. This seems to be serious to me seems they took him back in for another & so quickly. Any light you could shed would be appreciated greatly. Mrs Margolin