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Complications of sinusitis: orbit, bone and brain
Sinus infection spreads into the orbit (mainly from the ethmoid sinuses in children) or into bone and brain (mainly from the frontal sinus in adolescents); the Chandler classification sets the urgency, and contrast CT separates cellulitis treated with antibiotics from an abscess that sometimes needs drainage.
Why it matters in the exam
The exam shows a child with a cold, fever and periorbital swelling and asks for the Chandler stage and the decision: IV antibiotics alone or drainage. The stages: I — preseptal cellulitis (in front of the orbital septum, eye movements and vision normal); II — orbital cellulitis; III — subperiosteal abscess; IV — orbital abscess; V — cavernous sinus thrombosis. Pain on eye movement, proptosis, restricted movement and reduced visual acuity or colour vision indicate involvement of the orbit itself.
In a young child, a small medial subperiosteal abscess without visual compromise can be treated with IV antibiotics under close follow-up. Drainage (usually endoscopic) is needed when vision falls, the abscess is large or not medial, there is no improvement within 24 to 48 hours, or the child worsens. Cavernous sinus thrombosis shows bilateral findings, palsies of nerves III, IV and VI and reduced sensation in branches of nerve V, and it requires high-dose antibiotics and urgent imaging.
Intracranial complications — epidural abscess, subdural empyema, brain abscess and meningitis — are commoner in adolescents and young men with frontal sinusitis, and present with severe headache, fever, vomiting, altered consciousness or seizures. Pott puffy tumour is osteomyelitis of the frontal bone with a subperiosteal abscess that appears as a soft forehead swelling. In these cases contrast CT and MRI are performed and care is shared with neurosurgery.
Key points
- Chandler: I preseptal to V cavernous sinus.
- Orbital source: ethmoid in children.
- Intracranial source: frontal in adolescents.
- Contrast CT for any suspicion of orbital involvement.
- Drain: reduced vision, large abscess, or no improvement in 24 to 48 hours.
Summary table
| Chandler stage | Finding | Treatment |
|---|---|---|
| I preseptal | Eyelid swelling, eye movements and vision normal | Antibiotics, often oral with follow-up |
| II orbital cellulitis | Orbital oedema without abscess | IV antibiotics |
| III subperiosteal abscess | Displaced globe, restricted movement | IV; drain if vision affected, large abscess or no improvement in 24 to 48 hours |
| IV orbital abscess | Severe proptosis, ophthalmoplegia | Urgent drainage |
| V cavernous sinus thrombosis | Bilateral findings, nerves III, IV, VI | High-dose antibiotics, imaging, multidisciplinary team |
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Sources
- EPOS 2020: European Position Paper on Rhinosinusitis and Nasal Polyps, 2020 — Complications of acute rhinosinusitis
- Cummings Otolaryngology: Head and Neck Surgery, 7th edition (2021) — Complications of rhinosinusitis
- Nelson Textbook of Pediatrics, 22nd edition (2024) — Sinusitis
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.