Pinpoint accuracy: guided core biopsy diagnostic accuracy in musculoskeletal lesions

Core biopsy is integral in the work-up of diagnosis for musculoskeletal lesions. Prior to referral through Christchurch hospital-a tertiary referral centre for sarcomas/musculoskeletal lesions, many patients undertake guided core biopsy in peripheral hospitals. We wished to assess the accuracy of these biopsies undertaken in the peripheral centres and compare to those done in the tertiary setting.

A retrospective analysis of image-guided core biopsies done in the South Island of New Zealand over a 5 year period was performed. An electronic database enquiry was made, and electronic notes were then screened for core biopsy results including subsequent biopsies done of the same lesion. Results from guided core biopsy were then recorded as diagnostic if the pathologist was able to reach or a definitive diagnosis, or guide management sufficiently.

223 patients with 229 biopsies were analysed. Overall accuracy of core biopsies were 83% across all centres. There were similar results between CT and ultrasound as well as soft tissue and bone lesions. Between the regions, the peripheral centres showed high accuracy compared with the tertiary centres.

The regional centres demonstrated high diagnostic yield, and the current practice of providing core biopsy locally where possible prior to referral to a tertiary sarcoma, remains valid.