I read with interest the article by Datta et al who undertook a retrospective analysis of 74 patients under the age of 2 years with subdural haemorrhage or subdural effusion diagnosed between 1992 and 2001.¹ The authors wrote that ultrasound was performed before computed tomography in 12 cases and that subdural haemorrhages were not seen in seven of these 12 cases. However, the ages of the patients in whom ultrasound was performed were not given. Datta et al suggested that ultrasound has no role in excluding …