文摘
Objectives To test the feasibility and accuracy of MR-guided soft tissue tumour biopsy at 3T, using the dynamic contrast-enhanced (DCE) information from staging MRI for intralesional targeting. Methods After obtaining written informed consent for this institutional review board-approved study, 53 patients with suspected soft tissue tumours prospectively underwent preoperative staging MRI at 3T, including DCE, and subsequent MR-guided core needle biopsy. In 44/53 cases, DCE was heterogeneous and was used for intralesional biopsy targeting. Surgical, whole-specimen histology was used as the gold standard in 43/44 patients and revealed 42 soft tissue tumours (24 men; 18 women; mean age, 52?years; range, 19 -84). Results Final surgical histology revealed eight benign lesions, six tumours of intermediate dignity, and 28 malignancies. All malignancies had shown heterogeneous DCE. The diagnostic yield of the biopsies was 100?% (42/42). Histological accuracy rates of biopsy were 100?% in predicting the dignity (42/42; 95?% CI [0.916 -1.000]), 95.2?% for the tissue-specific entity (40/42; 95?% CI [0.847 -0.987]), and 90.5?% for the tumour grade (38/42; 95?% CI [0.779 -0.962]). Conclusions Our preliminary study indicates that biopsy of soft tissue tumours can be performed accurately and safely with DCE targeted MR-guidance at 3T, using a combined staging/biopsy MRI protocol. Key Points -MR-guided soft tissue tumour biopsy using DCE for intralesional targeting is feasible. -Targeting by staging-MRI allows reliable planning of the biopsy approach. -The method seems accurate and safe as a combined staging/biopsy procedure in outpatients. -DCE-targeted biopsy seems useful in challenging large and heterogeneous tumours.