I got dizziness ( left side ) when put my head to sleep and some time in a day when turn my head , pulsation in left ear my mri and brain ct normal?

Pulsatile tinnitus : What you are describing sounds like pulsatile tinnitus - pulsating buzzing or ringing in the ear. Although most causes can be detected on ct and mri, some conditions can go undetected.Dural vascular malformations are often elusive on both ct and MRI requiring conventional angiography to make this diagnosis. Benign intracranial hypertension also often has no abnormal findings on ct or mri.