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American Journal of Neuroradiology 28:610-612, April 2007
© 2007 American Society of Neuroradiology

Case Report
HEAD & NECK

Arachnoid Granulations of the Posterior Temporal Bone Wall: Imaging Appearance and Differential Diagnosis

V. VandeVyvera,c, M. Lemmerlinga, B. De Foerb, J. Casselmanb and K. Verstraetec

a Department of Radiology, AZ Sint-Lucas, Gent, Belgium
b Department of Radiology, AZ Sint-Augustinus, Antwerp, Belgium
c Department of Radiology, University Hospital, Gent, Belgium

Please address correspondence to Vincent VandeVyver, Department of Radiology, University Hospital Gent, De Pintelaan 185, 9000 Gent, Belgium; e-mail: vincent.vandevyver{at}gmail.com

SUMMARY: Arachnoid granulations are rarely seen on high-resolution CT (HRCT) at the posterior temporal bone wall, where they appear as erosions, without bone spicules and often with a lobulated surface. Differential diagnosis includes endolymphatic sac tumor, paraganglioma, chordoma, and chondromatous and metastatic tumors. MR imaging can confirm the diagnosis because arachnoid granulations behave like CSF without gadolinium enhancement. This report aims to illustrate the appearance and differentiation of temporal bone arachnoid granulations on HRCT and MR imaging.




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