Table 1. MRI findings in cases diagnosed with Chiari malformation type 1 and hydrosyringomyelia.

MRI: magnetic resonance imaging, M: male; F: female

Case no.	Age (year)	Sex	MRI findings
1	31	F	MRI of the cervical spine with whole spine screening revealed: Displacement of the cerebellar tonsils by 12 mm. Associated hydrosyringomyelia extends from the C2-C3 to the D5-D6 intervertebral disc level.
2	34	M	MRI of the cervical spine with whole spine screening revealed: Displacement of the cerebellar tonsils by 11 mm. Associated hydrosyringomyelia extends from the C2 to D9 vertebral levels.
3	32	M	MRI of the brain and cervical spine revealed: Displacement of the cerebellar tonsils by 12 mm. Associated small syrinx extends from the C3 to C4 vertebral level.
4	08	F	MRI of the cervical spine with whole spine screening revealed: Displacement of the cerebellar tonsils by 9 mm. Associated hydrosyringomyelia extends from the C5 to D4 vertebral levels.
5	08	M	MRI of the cervical spine revealed: Displacement of the cerebellar tonsils by 4 mm. Extensive changes of hydrosyringomyelia involving the complete length of the spinal cord, extending from the cervico-medullary junction up to conus medullaris.
6	32	M	MRI of the brain revealed: Descent of the cerebellar tonsils into the upper spinal canal by 22 mm. Associated small syrinx at the level of the C2-C3 intervertebral disc level. Incidental finding of flattening of the skull base: Platybasia.