Table 3.
Summary sonographic nerve size median nerves and brachial plexus
| Cross‐sectional area, mm2 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Right median nerve | Left median nerve | Right brachial plexus | Left brachial plexus | ||||||||
| Patient | Reference values | Forearm | Upper arm | Forearm | Upper arm | Upper trunk | Middle trunk | Lower trunk | Upper trunk | Middle trunk | Lower trunk |
| Normal value | <9 | <9 | <9 | <9 | <8 | <8 | <8 | <8 | <8 | <8 | |
| Disease specific cutoff valuea | >10 | >13 | >10 | >13 | >8 | >8 | >8 | >8 | >8 | >8 | |
| 1 | 5.5 | 7.9 | 7.0 | 6.8 | 3.3 | 8.5 | 9.4 | 5.4 | 9.4 | 8.3 | |
| 2 | 10.6 | 11.0 | 10.2 | 13.7 | 5.3 | 7.0 | 4.9 | 6.5 | 6.1 | 5.5 | |
| 3 | 11.8 | 18.6 | 12.1 | 18.9 | 6.0 | 5.7 | 8.5 | 5.2 | 8.5 | 8.8 | |
| 4 | 13.0 | 14.1 | 9.6 | 10.7 | 6.1 | 3.4 | 4.8 | 5.9 | 4.9 | 5.4 | |
| 5 | 11.0 | 11.9 | 11.8 | 15.6 | 7.3 | 5.0 | 5.2 | 9.8 | 10.6 | 8.8 | |
| 6 | 9.5 | 14.2 | 10.4 | 13.8 | 7.3 | 5.4 | 4.1 | 9.7 | 7.5 | 6.2 | |
a
Sonographic enlargement of nerve size (median nerve at forearm and upper arm and brachial plexus any trunk) compatible with chronic inflammatory neuropathy indicated in boldface type.