Tsunoda R, Fukaya T
Department of Otolaryngology, Kanto Teishin Hospital, Tokyo, Japan.
J Laryngol Otol. 1997 Feb;111(2):148-51. doi: 10.1017/s0022215100136692.
A rare case of extracranial meningioma presenting as a tumour of the external auditory meatus is reported. Biopsy indicated a diagnosis of meningioma, but the radiological appearance was unusual. For example, computed tomography (CT) scans showed an unenhanced tumour mainly located in the squamous part of the temporal bone which expanded into the external meatus destroying the temporal bone. Magnetic resonance imaging (MRI) revealed that the tumour did not extend into the intradural space. This meningioma, had an obvious tendency for extracranial development. According to the operative findings, the tumour arose from the middle cranial fossa dura and extended through the air cells of the temporal bone into the external meatus, instead of growing intracranially. Secondary extracranial meningiomas of the temporal bone usually have a large intracranial component and cause neurological symptoms. However, this was a very rare case of a small meningioma causing no symptoms except for conductive hearing loss.
报告了一例罕见的颅外脑膜瘤，表现为外耳道肿瘤。活检显示诊断为脑膜瘤，但影像学表现不寻常。例如，计算机断层扫描（CT）显示一个主要位于颞骨鳞部的未强化肿瘤，该肿瘤扩展至外耳道，破坏了颞骨。磁共振成像（MRI）显示肿瘤未延伸至硬膜内间隙。这种脑膜瘤有明显的颅外发展倾向。根据手术所见，肿瘤起源于中颅窝硬脑膜，通过颞骨气房延伸至外耳道，而非颅内生长。颞骨继发性颅外脑膜瘤通常有较大的颅内成分并引起神经症状。然而，这是一例非常罕见的小脑膜瘤，除传导性听力损失外无其他症状。
