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AJNR - American Journal of Neuroradiology

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MR Imaging of the Enlarged Endolymphatic Duct and Sac Syndrome by Use of a 3D Fast Asymmetric Spin-echo Sequence: Volume and Signal-intensity Measurement of the Endolymphatic Duct and Sac and Area Measurement of the Cochlear Modiolus

Shinji Naganawa^,a, Tokiko Koshikawa^a, Eriko Iwayama^a, Hiroshi Fukatsu^a, Tsuneo Ishiguchi^a, Takeo Ishigaki^a, Mitsuru Ikeda^a, Tsutomu Nakashima^a and Nobuyasu Ichinose^a

^a From the Departments of Radiology (S.N., T.K., E.I., H.F., Ts.I., Ta.I), Medical Information and Records (M.I.), and Otolaryngology (T.N.), Nagoya University School of Medicine, Nagoya, Japan; and Toshiba Nasu Works, Tochigi, Japan (N.I.).

View larger version (72K): [in a new window]   fig 1. Axial T2-weighted fast spin-echo image (4000/240/1; 0.8-mm thick) in an 18-year-old woman with EED and EES syndrome. The area of the EES is outlined (arrow). fig 2. Axial T2-weighted fast spin-echo image (4000/240/1; 0.8-mm thick) in a 20-year-old man with EED and EES syndrome. The area of the cochlear modiolus is outlined (arrow)

View larger version (83K): [in a new window]   FIG 3. Axial heavily T2-weighted image (4000/240/1; 0.8-mm thick) in a 19-year-old man with EED and EES syndrome. A septumlike structure (arrow) is seen in the intraosseous EES. The signal of the posterior, dural portion of the EES (arrowheads) is lower than that of the intraosseous portion. fig 4. Axial T2-weighted fast spin-echo image (4000/240/1; 0.8-mm thick) in a 20-year-old man with EED and EES syndrome. The diameter of the EED and EES is indicated with a white line (arrow) at the midpoint between the common crus and its external aperture. In this case, the diameter is 2.4 mm

View larger version (26K): [in a new window]   FIG 5. A–E, Scatter plots of the average hearing level versus area of the cochlear modiolus (A), volume of the EED and EES (B), signal intensity ratio of EES/CSF (C), diameter of the EED and EES (D), and patient age (E). None of these values correlated with hearing level.