Abstract #0351

Diffusion Time Dependence in the Evaluation of Choroid Plexus Cysts

Yutaka Ikenouchi¹, Tomoko Maekawa^1,2, Masaaki Hori¹, Katsutoshi Murata³, Thorsten Feiweiwer⁴, Christina Andica ¹, Shohei Fujita^1,2, Ryusuke Irie^1,2, Akifumi Hagiwara^1,2, Kouhei Kamiya^1,2, Akihiko Wada¹, and Shigeki Aoki¹

¹Department of Radiology, Graduate School of Medicine, Juntendo University, Tokyo, Japan, ²Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan, ³Siemens Healthcare Japan KK, Tokyo, Japan, ⁴Siemens Healthcare GmbH, Erlangen, Germany

To obtain information regarding the internal structure of choroid plexus cysts (CPCs) that appear hyperintense on DWI, we investigated the ADC values acquired with a shorter diffusion time using an oscillating gradient spin-echo (OGSE). The ADC values for twenty-seven patients with CPCs were measured with effective diffusion time (Δeff) of 6.5 and 35.2 ms. The ADC values of CPCs were significantly higher at the Δeff of 6.5 ms than with Δeff of 35.2 ms. The dependence of ADC values on the diffusion time in CPCs suggested spatially restricted diffusion.

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