GIST術後の転移性肝腫瘍にソナゾイド造影超音波を用いたラジオ波焼灼療法(RFA)が有効であった1例

We report a case of gastrointestinal stromal tumor (GIST) with liver metastases which was undetectable by B-mode ultrasonography, effectively treated by radiofrequency ablation using contrast-enhanced ultrasonography US. A 43-year-old woman was admitted for the treatment of 6 lesions up to 4cm in diameter, which had emerged from necrotic sites within the liver after imatinib treatment. The recurrent lesions were not detected on B-mode US, and it was difficult to perform radiofrequency ablation (RFA) treatment. Using a contrast-enhanced agent (sonazoid), the recurrent lesions were detected and treated by RFA. RFA is considered to be an effective treatment for GIST with liver metastases that tolerate imatinib administration.