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Post hoc analysis of the failure of the puncture in the US and CEUS groups.
| Cause | CEUS group | US group |
|---|---|---|
| Necrotic tissue | 0 | 7 |
| Lung tissue and skeletal muscle tissue | 0 | 3 |
| Insufficient organization | 1 | 0 |
| Complications | 0 | 2 |
| Poor patient cooperation | 1 | 1 |
| Total | 2 | 13 |
CEUS, contrast-enhanced ultrasound; US, ultrasound.
