Invited. MRI‐guided biopsy of bone in a hybrid system

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Abstract
This is a report of our experience with percutaneous, MRI‐guided biopsies in 25 patients with skeletal lesions using a 1.5‐T MR hybrid system. Twenty‐five consecutive patients with skeletal lesions were referred for MRI‐guided biopsy. Biopsies were performed with a 1.5‐T Philips Gyroscan (Philips Medical Systems, Best, The Netherlands) combined with a c‐arm fluoroscopy. Specimens were obtained percutaneously either with a 14‐ or 18‐gauge “side‐slit” type of biopsy needle (n = 10 skeletal lesions that had penetrated through the cortex), or using a prototype coaxial drill system powered either by hand or an optional motor (n = 15 skeletal lesions still covered with cortical bone). All but two biopsies could be completed within the MR unit. For one patient, who required a transpedicular approach to a lumbar vertebra, and for one child, who required general anesthesia, we decided to switch to CT guidance. In 19 of the 25 cases (17 of the 23 cases performed in MR), the sample was sufficient and the histopathologic diagnosis was confirmed. Three patients had an inadequate sample, and three others had adequate samples but inaccurate results. No procedural complications occurred. Percutaneous biopsy of skeletal lesions performed under MRI‐guidance was found to be safe and reasonably accurate. There were no procedural complications in our small series. MRI may be used as an alternative to CT, but its role vis‐à‐vis CT has yet to be ascertained.