Table 2.

Contingency of the 59 patients who underwent both SN-TCD and presynaptic SPECT imaging

Total number of patients n = 59	presynaptic SPECT abnormal	presynaptic SPECT normal
SN-TCD positive (= abnormal)	23a	3c
SN-TCD negative (= normal)	23b	10d

SN substantia nigra, TCD transcranial duplex, SPECT Single Photon Emission Computer Tomography

a: n = 23 19 PD, 3 APS, 1 undiagnosed

b: n = 23 18 PD, 3 APS (2 CBD, 1 PSP), 2 undiagnosed

c: n = 3 2 VP, 1 spontaneous disappeared parkinsonism

d: n = 10 1 PD, 2 VP, 2 ET, 1 DIP, 3 rest group, 1 undiagnosed