AB113. SOH25_AB_311. Primary extradural spinal tumours in Ireland—who, what, where, and when: a 30-year review of the National Spinal Injuries Unit

Background: The aim of this project is to review the demographics of all patients treated for primary extradural spinal tumours in the National Spinal Injuries Unit (NSIU) over a 30-year period. Despite staging of these tumours first being described by Enneking in 1986, surrounding literature remains scant, given their rarity and is mainly in the form of case reports. Representing only 4% of spinal tumours, we aim to contribute to the existing body of literature on these tumours and their recurrence rate, from an Irish perspective.

Methods: A retrospective case series of all patients treated surgically for primary extradural spinal tumours including chondrosarcomas, chordomas and giant cell tumours in Ireland over a 30-year period. Tissue diagnosis, gender, age, and mortality were all reviewed along with recurrence rates.

Results: In total, 31 patients with primary extradural spinal tumours were treated between 1992 and 2021 in NSIU. Of these patients, two-thirds were male, one-third were female, and average age of diagnosis was 44.4 years. Intra-operative adverse events were recorded at 32%, and post-operative complication rate was 74%. Almost half (48.39%) of patients experienced a recurrence of their tumour and these patients had a 20% mortality rate at 10 years.

Conclusions: Primary extradural spinal tumours are rare but invasive tumours. Our review demonstrates the morbidity and mortality associated with this disease type. These tumours affect young males and further research is required to establish best treatment practice from a multi-disciplinary team perspective for these patients to reduce recurrence rates and associated mortality.

Keywords: Primary extradural spinal tumours; rare tumours; retrospective review; spinal surgery; tumour recurrence