Female, 14 years old, with Chiari and syrinx, yearly follow-up. The cerebral tonsils descend approximately 5 mm below the level of the foramen magnum, unchanged from prior. Moderate crowding of foramen magnum is again observed. Attenuated but detectable biphasic CSF flow is seen anteriorly through the foramen magnum. No obvious flow is detected, however, posterior to the cerebellar tonsils.A syrinx cavity is redemonstrated within the central aspect of the spinal cord. The most prominent component begins at the mid C6 level and continues inferiorly to the upper T1 level. At its point of maximum caliber, the syrinx measures up to 4 x 3 mm which is slightly increased from prior exams. As visualized on sagittal imaging only, trace syrinx or prominence of the central canal of the spinal cord continues inferiorly into the thoracic region.Straightening of the cervical lordosis is likely positional. Sagittal alignment is otherwise unremarkable. Vertebral body height and morphology are within normal limits. No pathologic marrow replacement or edema is detected. No significant abnormalities of the intervertebral discs are seen. The spinal canal and neural foramina remain patent.
1.Demonstration of findings compatible with Chiari I malformation without significant interval change.2.Mild interval increase in the caliber of the syrinx spanning from C6 to T1.