PT  - JOURNAL ARTICLE
AU  - VandeVyver, V.
AU  - Lemmerling, M.
AU  - De Foer, B.
AU  - Casselman, J.
AU  - Verstraete, K.
TI  - Arachnoid Granulations of the Posterior Temporal Bone Wall: Imaging Appearance and Differential Diagnosis
DP  - 2007 Apr 01
TA  - American Journal of Neuroradiology
PG  - 610--612
VI  - 28
IP  - 4
4099  - http://www.ajnr.org/content/28/4/610.short
4100  - http://www.ajnr.org/content/28/4/610.full
SO  - Am. J. Neuroradiol.2007 Apr 01; 28
AB  - 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.