Yoshida Tadao, Sone Michihiko, Naganawa Shinji, Nakashima Tsutomu
Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine, Japan.
Auris Nasus Larynx. 2011 Aug;38(4):551-4. doi: 10.1016/j.anl.2010.12.011. Epub 2011 Jan 19.
Intracochlear schwannomas (ICSs) are rare tumors. The diagnosis of ICS is based on high-resolution magnetic resonance imaging (MRI), which should be used for the accurate determination of the location of tumors. Recent advancements in imaging technologies and software enable the precise regional diagnosis of ICS. We experienced a case of intracochlear schwannoma with a diagnosis of progressive hearing loss and tinnitus. Audiometry revealed severe hearing loss in the right ear with remaining low-frequency hearing. MRI showed an abnormal lesion in the cochlea. Three-dimensional real inversion recovery (3D rIR) and constructive interference in steady state (CISS) MRI revealed the size and shape of the tumor via identification of the cochlear nerve and cochlear fluid space. CISS and 3D rIR sequences provide useful information regarding the boundaries of tumors and the tissues that surround them.
耳蜗内神经鞘瘤（ICSs）是罕见的肿瘤。ICS的诊断基于高分辨率磁共振成像（MRI），该成像应用于准确确定肿瘤的位置。成像技术和软件的最新进展使得ICS的精确区域诊断成为可能。我们遇到一例耳蜗内神经鞘瘤患者，诊断为进行性听力损失和耳鸣。听力测定显示右耳严重听力损失，仅残留低频听力。MRI显示耳蜗有异常病变。三维真实反转恢复（3D rIR）和稳态构成性干扰（CISS）MRI通过识别耳蜗神经和耳蜗液间隙揭示了肿瘤的大小和形状。CISS和3D rIR序列提供了有关肿瘤边界及其周围组织的有用信息。
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