Can a ct scan: ct venogram detect any problems in the brain regarding the vessels, and tumor?specifically temporal arteritis?

Temporal arteritis is typically diagnosed with a biopsy of the artery. A CT venogram, as the name implies, would assess veins and a CT arteriogram would assess arteries. These CT studies are typically used to look for blockages or leaking vessels and are not the studies of choice to assess inflammation of the arterial wall.

It would be very unique for you to have temporal arteritis at age 29, and a screening blood study (sed rate and CRP) could likely dismiss this diagnosis if normal. A CAT scan is a good screen for tumor, and a venogram looks mainly at veins, but neither would be useful for a localized giant cell arteritis, which would involve the temporal arteries.