Pott's puffy tumour is an infrequent entity characterised by one or more su
bperiosteal abscesses associated with frontal bone osteomyelitis. Although
cases in patients of all ages have been reported, teenagers are the most fr
equently affected. Early diagnosis and aggressive treatment are essential b
ecause of the high risk of severe neurological complications, such as epidu
ral abscess, subdural empyema, and secondary septic thrombosis of the dural
sinuses. This paper describes the case of a patient with a subperiosteal a
bscess resulting from sinusitis, with orbital and intracranial extension, a
nd subsequent neurological complications. Despite modern methods of diagnos
is and treatment, 13 new cases have been published in the last 5 years; in
at least 3 (23%) of these cases there were serious neurological complicatio
ns. Upper respiratory infections and sinusitis are leading causes of visits
to the emergency department in the paediatric age group; however, no risk
factors for poor outcome have so far been identified in any of these patien
ts.