A 36-year-old man presented with a 2-week history of a progressive forehead swelling and a frontal headache. He had no visual or neurological symptoms and there was no history of trauma. However, he reported a 4-week history of nasal obstruction with purulent nasal discharge. On examination, there was a 15x6 cm erythematous, fluctuant forehead swelling. Naso-endoscopy demonstrated purulent discharge bilaterally from the middle meati. A CT scan of the brain and paranasal sinuses demonstrated acute pansinusitis, osteomyelitis of the frontal bone with an associated subperiosteal abscess and an extradural abscess (figures 1 and 2). This is known as a Pott’s puffy tumour, named after Sir Percival Pott and is a rare complication of frontal sinusitis. 1 The patient underwent emergency endoscopic drainage of the sinuses and drainage of the frontal abscess via an external left eyebrow incision. Two hundred millilitres of pus was drained. He completed a 4-week course of intravenous ceftriaxone, 2 g once a day, and saline nasal irrigation three times a day. This was administered alongside a 2-week course of betamethasone sodium phosphate nasal drops, two drops twice a day in both nostrils. Serial post-operative CT imaging after 7, 12 and 20 days demonstrated resolution of the frontal abscess and an improvement of the extradural abscess.