What type of imaging is preferred to evaluate a syrinx in syringomyelia?

The preferred imaging modality for evaluating a syrinx in syringomyelia is MRI because it provides excellent contrast resolution in soft tissues, allowing for detailed visualization of both the syrinx and the surrounding structures of the spinal cord. MRI is particularly effective in identifying the size, location, and any associated abnormalities of the syrinx, which are crucial information for diagnosis and management of the condition.

CT scans, while useful for some conditions involving the bony structures of the spine, do not offer the same level of detail in soft tissue evaluation as MRI. Ultrasound is limited in its ability to visualize the spinal cord and is typically used in pediatric patients due to their smaller size. X-rays primarily show bony structures and would not provide the necessary information about soft tissue lesions like a syrinx. Therefore, MRI stands out as the most appropriate choice for accurately assessing syringomyelia.