Table 6

False negative diagnosis of PD in three cases on blinded video review: reviewer 2

False Negatives	Blinded video Diagnosis	Clinical features leading to diagnosis					FP-CIT result	Drugs at time of video
False Negatives	Blinded video Diagnosis	NPRT	NFB	MF	NGI	DF	FP-CIT result	Drugs at time of video
Case 9	DT	−	+	−	−	+	Abnormal (grade 1) Congruent	12 months on L-dopa 300 mg/day
Case 34	DT	−	+	−	−	−	Abnormal (grade 1) Congruent	8 months on L-dopa 300 mg/day
Case 35	DT	+	+	−	−	+	Abnormal(grade 1 JP; grade 2 JB) Congruent	Drug naive

Congruent refers to predominant FP-CIT abnormality contra-lateral to most affected clinical side.
DF, dystonic features, for example collis, thumb hyperextension, shoulder elevation; DT, dystonic tremor; FP-CIT, N-ω-fluoro-propyl- 2ß-carbomethoxy-3ß-(4-iodophenyl) nortropane; JP and JB refer to nuclear physicians across the two sites; MF, myoclonic flurries; NFB, no fatiguable bradykinesia; NGI, no gait impairment; NPRT, no pill rolling rest tremor PD, Parkinson's disease.