Belli A M, Dow C J, Monro P
Department of Radiology, St James' Hospital, London.
Br J Radiol. 1987 Oct;60(718):1026-8. doi: 10.1259/0007-1285-60-718-1026.
Extradural abscess can be a complication of frontal sinusitis. The chronicity of this condition can give rise to extreme frontal hyperostosis which can be an important radiological sign in a condition which may be clinically obscure.