The Radiologists' Guide to Spinal Separation Surgery: What Does the Surgeon Want to Know?

Spinal tumours are an uncommon but significant cause of pain, fractures, instability, and cord compression, leading to poor quality of life and mortality. Separation surgery is a rapidly advancing technique that has seen increased utilisation in the field of spinal oncology surgery. Separation surgery can be described as a resection technique that decompresses the spinal cord whilst creating an ablative target for high-dose stereotactic radiotherapy to achieve durable local control while minimising the risk of radiation myelopathy. This has facilitated the delivery of stereotactic radiotherapy, as well as created potential for use in managing primary bone tumours of the spine. From a radiology standpoint, optimal outcomes depend on meticulous preoperative characterisation of tumour volume and stability (e.g., ESCC grade and SINS), clear communication of anatomic constraints relevant to approach and fixation, and systematic postoperative surveillance to distinguish expected postoperative appearances from early recurrence or complications. We present our radiological experience and report recommendations while evaluating spinal oncology separation surgery.