A cat scan without contrast can that still detect a brain tumor?

Not always. It is much harder to detect smaller lesions on non-contrast head ct, but large tumors causing swelling or pressure on other parts of the brain can usually be detected. Usually brain MRI with contrast is more sensitive and gives me a more detailed picture when I am trying to evaluate for brain tumors.
Yes. Contrast dye helps to show the vascularity and fluid areas however a normal ct will show tumors and areas of infection.

Related Questions

Had a cat scan on head will this now cause a brain tumor one day?

No. You are no more risk for brain tumor now than you were before you had the CAT scan. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Drink enough water daily so that your urine is mostly colorless. Practice safe sex. Get HPV vaccine. Read more...

Would swelling of brain tissues from brain tumor be shown on a non contrast CT scan?

Yes. It is possible to see brain swelling from tumor on non contrast CT. FYI there are better modalities to test for this such as MRI. Read more...

2 years and 8 months ago CT scan w&wo contrast ruled out a brain tumor now im worry again can a brain tumor grow that fast and cause symptoms im 27?

Brain tumor. It is possible but is very unlikely. Specially if the symptoms you have now are the same you had 2 1/2 years ago. Discuss your symptoms with your doctor. He may be able to determine what is the problem causing your symptoms and relief you level if anxiety. Read more...