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Table 1: Syrinx maximum transverse diameter and location in participants^{^a}
Patients with Syrinx Syrinx Location Spinal Injury Maximum Syrinx Diameter (mm) Flow Measurements
SP1 T6–T7 T6 4.2 BOS, T5^{^b} (AS), T7 (BS)
SP2 C6–T1 C6 17.1 BOS, C4^{^b} (AS), T2 (BS)
SP3 C1–C6 C6 23.4 BOS (AS), C4,^{^b} T1 (BS)
SP4 T2–T6 T5 8.2 BOS, T1^{^b} (AS), T7 (BS)
SP5 T1–T4 T3 15.0 C7^{^b} (AS), T5 (BS)
SP6 L1–L2 L1 9.2 BOS, T12^{^b} (AS), L2 (BS)
Note:—AS indicates above the syrinx; BS, below the syrinx; BOS, base of skull.
↵a Data obtained at these levels were used to compare flow in the participants with syrinx (Fig 2).
↵b CSF flow measurements obtained at this spinal level were used to compare flow with that of controls at C5 (Fig 3).

Patients with Syrinx	Syrinx Location	Spinal Injury	Maximum Syrinx Diameter (mm)	Flow Measurements
SP1	T6–T7	T6	4.2	BOS, T5^{^b} (AS), T7 (BS)
SP2	C6–T1	C6	17.1	BOS, C4^{^b} (AS), T2 (BS)
SP3	C1–C6	C6	23.4	BOS (AS), C4,^{^b} T1 (BS)
SP4	T2–T6	T5	8.2	BOS, T1^{^b} (AS), T7 (BS)
SP5	T1–T4	T3	15.0	C7^{^b} (AS), T5 (BS)
SP6	L1–L2	L1	9.2	BOS, T12^{^b} (AS), L2 (BS)