Nasu K, Arima K, Yoshimatsu J, Miyakawa I
Department of Obstetrics and Gynecology, Oita Medical University, Oita, Japan.
Gynecol Obstet Invest. 1998 Aug;46(2):142-4. doi: 10.1159/000010003.
We compared the diagnostic utility of computed tomography (CT) and magnetic resonance imaging (MRI) in a patient with a pelvic schwannoma. This 46-year-old woman was admitted for evaluation of a retroperitoneal pelvic mass and myoma uteri. The retroperitoneal pelvic mass had been detected by a CT scan at a routine health examination. A CT scan revealed a well-circumscribed cystic tumor (4 x 3 cm) at the right internal obturator muscle portion. The CT number of the inner part of the tumor was 21. Only the cyst wall was enhanced by injection of a contrast medium. MRI showed a 4 x 3 x 3-cm retroperitoneal cystic tumor that demonstrated low-intensity signals on T1-weighted images and high-intensity signals on T2-weighted images. Small areas of low intensity inside the tumor were observed on T2-weighted images. Histological examination revealed a typical schwannoma of mixed Antoni type A and type B. These findings indicate that both MRI and CT are useful for diagnosis of retroperitoneal schwannomas.
我们比较了计算机断层扫描（CT）和磁共振成像（MRI）对一名盆腔神经鞘瘤患者的诊断效用。这名46岁女性因评估腹膜后盆腔肿块和子宫肌瘤入院。该腹膜后盆腔肿块在常规健康检查的CT扫描中被发现。CT扫描显示在右闭孔内肌部分有一个边界清晰的囊性肿瘤（4×3厘米）。肿瘤内部的CT值为21。注射造影剂后仅囊肿壁有强化。MRI显示一个4×3×3厘米的腹膜后囊性肿瘤，在T1加权图像上呈低强度信号，在T2加权图像上呈高强度信号。在T2加权图像上观察到肿瘤内部有小面积的低强度区域。组织学检查显示为典型的Antoni A型和B型混合的神经鞘瘤。这些发现表明MRI和CT对腹膜后神经鞘瘤的诊断均有用。
