Can brain herniation be seen on ct?

Yes. It can be seen in a number of circumstances - tumors e.G can cause slow herniation of brain tissue into an adjacent compartment without severe symptoms whereas traumatic herniation is usually accompanied by severe symptoms (coma or even death).
Yes. Brain herniation is a potentially deadly side effect of very high intracranial pressure that occurs when a part of the brain is squeezed across structures within the skull. The brain can shift across many structures. It can be diagnosed with ct or mri.