Which imaging plane is optimal for evaluating Arnold Chiari Malformation?

The sagittal imaging plane is optimal for evaluating Arnold Chiari Malformation because it provides a clear view of the relationship between the cerebellum and the brainstem, as well as the location of the tonsils in relation to the foramen magnum. This configuration allows for better visualization of the downward displacement of the cerebellar tonsils into the spinal canal, which is a key characteristic of the malformation.

In the sagittal plane, the anatomy can be assessed in an uninterrupted manner, facilitating the identification of subtle changes or abnormalities that might not be as evident in other planes. By evaluating these structures in a straight, longitudinal format, radiologists can accurately determine the degree of herniation and assess associated structural anomalies.

In contrast, other planes may not provide as comprehensive a view of the relevant anatomy and relationships. For instance, the axial and coronal planes can show some aspects of the malformation but may overlook critical anatomical details and their spatial relationships that are best visualized in the sagittal plane. Thus, the sagittal view is considered superior for the assessment of Arnold Chiari Malformation.