 There are postoperative findings related to suboccipital craniectomy and C1 laminectomy for decompression of Chiari malformation. The cerebellar tonsils are unchanged in appearance, laying 7 mm below the basion. There is mildly diminished CSF spaces ventrally and dorsally at the foramen magnum but not significantly changed. Biphasic flow is slightly diminished but otherwise preserved ventrally and dorsally at the foramen magnum. Finding is unchanged. There is a small focus of tenting involving the left dorsal cerebellar surface seen on the high-resolution fiesta sequence which is unchanged and may represent scarring.There is focal turbulent flow with simultaneous cranio-caudal and caudo-cranial flow dorsal to the dens in the anterior cervical subarachnoid space but there is good CSF space on the sagittal FIESTA sequence at this level and unchanged. The partially imaged pituitary is prominent but within normal limits for age and better assessed on prior dedicated pituitary studies.
Examination limited to CSF flow study demonstrating unchanged postsurgical changes of Chiari decompression with no significant change in appearance of the low-lying cerebellar tonsils. There is mildly diminished CSF space ventrally and dorsally which is not significantly changed. Biphasic flow is slightly diminished but otherwise preserved ventrally and dorsally at the foramina magnum. No significant change. There is a small focus of tenting involving the left dorsal cerebellar surface seen on the high-resolution FIESTA sequence which is unchanged and may represent scarring.