Endoscope Assisted Combined Drainage of Sino-Orbital Abscess: Technique Revisited.

Orbital complications of acute rhinosinusitis may present with painful proptosis and ophthalmoplegia. Surgical management, when required comprises of endonasal endoscopic sinus clearance with or without external orbital abscess drainage. External drainage involves blind dissection and carries a risk of iatrogenic injury to periorbital structures. We describe a novel technique of endoscope guided orbital abscess drainage under direct visualisation via the external incision site. Patients with orbital cellulitis secondary to rhinosinusitis and planned for surgical intervention were recruited. After endonasal endoscopic sinus surgery, the orbital abscess cavity was opened and an endoscope was inserted externally. The cavity was examined; loculi were opened under direct visualisation till drainage was complete. This procedure was performed in seven patients with a successful outcome. The mean time to resolution was 1.5 months (36.4 ± 18.2 days). None of the patients had any recurrence or residual disease on follow up. In addition, in two cases with obstructed sinus drainage and "walling off" of frontal sinus, visualisation of the instrument placed in the drained abscess cavity via endo-nasally inserted endoscope confirmed the re-establishment of continuity of sinus opening. This approach may allow the surgeon to drain multiloculated abscess completely under direct visualization while minimising iatrogenic damage to periorbital structures. Real time display using endoscopic camera on the monitor screen also serves as a teaching and training tool during the procedure. Technique utilises the existing endoscopic set-up without the need for additional instrumentation.