Computed tomography (CT)

What it is

Computed tomography (CT) is an imaging test that uses X-rays to produce detailed cross-sectional images, particularly good at showing bone. In Chiari malformation, CT is useful for evaluating the bony anatomy of the skull base and craniocervical junction.

Understanding Computed tomography (CT)

While MRI is the primary test (best for soft tissues like the brain and spinal cord), CT excels at showing bone detail. In Chiari, CT can help evaluate the bony structures of the craniocervical junction — important for assessing associated bony abnormalities such as basilar invagination, a retroflexed odontoid, atlanto-occipital assimilation, or other features relevant to complex Chiari. CT is also useful for surgical planning, especially when bony procedures or fusion are being considered, and for the craniometric measurements that assess craniocervical alignment. Because CT uses radiation, it is used selectively, with MRI remaining the mainstay. CT and MRI together provide complementary soft-tissue and bony information. Understanding CT clarifies its role in evaluating the bony anatomy in Chiari.

Why it matters

Understanding CT helps families see how it complements MRI by showing bony detail — important for assessing craniocervical bony abnormalities and planning surgery, especially in complex Chiari.