Grey-scale sonography and sonoelastography for diagnosing carpal tunnel syndrome

Table 2 Summary of studies reporting the diagnostic value of the delta cross-sectional area of the median nerve for carpal tunnel syndrome

Ref.	delta CSA cut-off (mm2)	CTS wrists	Control wrists	Location	Sensitivity (%)	Specificity (%)	AUC
Klauser et al[18]	2	100	93	Maximal CSA in the carpal tunnel/proximal third of the pronator quadratus	99	100	0.9988
Roll et al[19]	4.16	83	83	Pisiform/6 cm proximal to the distal wrist crease	82.4	87.5	0.886
Tajika et al[20]	2	50	81	Pisiform/distal radioulnar joint	100	99	0.996

CSA: Cross-sectional area; CTS: Carpal tunnel syndrome; AUC: Area under curve.