• Sinusitis/complications
• abscess
• osteomyelitis
• tomography
• x-ray computed
• surgery
• infectious diseases
• neurosurgery
• ENT
• neuroradiology

A 60-year-old woman presented with a 4-week history of unilateral forehead swelling following a coryzal episode. She described frontomaxillary pain and nasal discharge. Examination confirmed a fluctuant non-tender swelling (figure 1A) and ipsilateral mucopurulent rhinorrhoea. Neuro-ophthalmic examinations were unremarkable. A contrast-enhanced CT scan revealed a right-sided pansinusitis (figure 1B), an external subperiosteal collection with an underlying small extradural collection (figure 1C) and an interposed rarefied frontal bone (figure 1D). She underwent endoscopic sinus drainage with external frontal sinus trephine. The intracranial collection was managed conservatively with intravenous antibiotics and serial CT scans.