From: The predictive value of transcranial duplex sonography for the clinical diagnosis in undiagnosed parkinsonian syndromes: comparison with SPECT scans
Total number of patients n = 59
presynaptic SPECT abnormal
presynaptic SPECT normal
SN-TCD positive (= abnormal)
23a
3c
SN-TCD negative (= normal)
23b
10d