Table 2 Ultrasound imaging features of NMC/NMC-DTF
Patient | Age/Sex | Location | Morphology of involved nerve | Transformation to DTF | NMC-DTF size (cm) | NMC-DTF margin | NMC-DTF echo intensity and morphology | CDFI grade | Spatial relationship between NMC-DTF and involved nerves | Local recurrence |
|---|---|---|---|---|---|---|---|---|---|---|
1 | 22/F | sciatic nerve | Hypoechoic, fusiform enlargement | Yes | 12.6 × 6.3 × 3.4 | Well-circumscribed | Hypoechoic solid lesion, irregular shape | 1–2 | NMC-DTF envelops the branches of the left sciatic nerve | No |
2 | 2/M | sciatic nerve | Hypoechoic, fusiform enlargement, hyperechoic striated appearance in the nerve | Yes | 13.6 × 4.4 × 3.8 | Well-circumscribed | Solid lesion with heterogeneous internal echo, irregular shape | 1–2 | NMC-DTF envelops the proximal adjacent nerve | No |
3 | 6/M | sciatic nerve | Hypoechoic, fusiform enlargement | Yes | 24 × 17 × 12 | Well-circumscribed | Hypoechoic solid lesion, irregular shape | 1–2 | NMC-DTF envelops the proximal adjacent nerve | Twice |
4 | 10/F | brachial plexus | Nerve invisible due to massive NMC-DTF | Yes | 5.5 × 5.5 × 3.3 | Well-circumscribed | Heterogeneous hypoechoic solid lesion, irregular shape | 1–2 | Nerve structure is invisible due to massive NMC-DTF | No |
5 | 2/M | sciatic nerve | Hypoechoic, fusiform enlargement | Yes | 6.3 × 4.6 × 3.6 | Well-circumscribed | Hypoechoic solid lesion, irregular shape | 1–2 | NMC-DTF envelops the proximal adjacent nerve | Once |
6 | 4/M | sciatic nerve | Hypoechoic, fusiform enlargement | No | — | — | — | — | — | No |
7 | 3/F | sciatic nerve | Hypoechoic, fusiform enlargement | No | — | — | — | — | — | No |