Table 1.
Characteristics of 25 tumors which were difficult to identify via conventional ultrasonography
| Characteristics of tumors | n | Detection (yes/all) |
|||
|---|---|---|---|---|---|
| CTAP/CTHA | US | RVS | |||
| (1) | Unclear margins, as seen in ultrasound images | 11 | 11/11 | 0/11 | 11/11 |
| (2) | Arising in the vicinity of areas coagulated following radiofrequency ablation | 5 | 5/5 | 0/5 | 5/5 |
| (3) | Could not be fully identified due to position beneath the diaphragm | 4 | 4/4 | 0/4 | 4/4 |
| (4) | Viable tumor emerging following transarterial chemoembolization in areas affected by posterior acoustic enhancement of lipiodol deposition | 4 | 4/4 | 0/4 | 4/4 |
| (5) | Recurrent tumor located at a resection stump following hepatectomy | 1 | 1/1 | 0/1 | 1/1 |