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(Radiology. 1999;213:819-823.)
© RSNA, 1999

Head and Neck Imaging

MR Imaging of the Cochlear Modiolus: Area Measurement in Healthy Subjects and in Patients with a Large Endolymphatic Duct and Sac1

Shinji Naganawa, MD, Tokiko Ito, MD, Eriko Iwayama, MD, Hiroshi Fukatsu, MD, Takeo Ishigaki, MD, Tsutomu Nakashima, MD and Nobuyasu Ichinose, MS

1 From the Departments of Radiology (S.N., T.Ito, E.I., H.F., T. Ishigaki) and Otolaryngology (T.N.), Nagoya University School of Medicine, 65 Tsurumai-cho, Shouwa-ku, Nagoya 466-8550, Japan, and the Toshiba Nasu Works, Tochigi, Japan (N.I.). From the 1998 RSNA scientific assembly. Received September 22, 1998; revision requested November 4; revision received March 19, 1999; accepted July 1. Address reprint requests to S.N.

PURPOSE: To evaluate the cochlear modiolus with thin-section magnetic resonance (MR) imaging in healthy subjects and patients with a large endolymphatic duct and sac, and to assess whether the cochlea is normal or abnormal in patients with a large endolymphatic duct and sac.

MATERIALS AND METHODS: MR images were obtained in 10 ears in five volunteers (group 1), 40 ears in 20 patients with bilateral sensory hearing loss (group 2), three ears in two patients with Mondini malformation (group 3), and 12 ears in seven patients with a large endolymphatic duct and sac (group 4).

RESULTS: In groups 1 and 2, all modiolar areas were larger than 4.0 mm2. In group 3, each modiolus was smaller than 2.0 mm2. In group 4, modiolar areas were smaller than 2.0 mm2 in eight ears and were larger than 4.0 mm2 in four ears.

CONCLUSION: Findings in this study confirm that a large endolymphatic duct and sac is frequently associated with modiolar deficiency, but the modiolar area is normal in some cases. This result does not support the recently proposed hypothesis that hearing loss with a large endolymphatic duct and sac is caused by the transmission of subarachnoid pressure forces into the labyrinth through a deficient modiolus.

Index terms: Ear, abnormalities, 213.1499 • Ear, anatomy, 213.92 • Ear, MR, 213.121416 • Magnetic resonance (MR), pulse sequence, 213.121416 • Magnetic resonance (MR), thin section, 213.121416




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