Tortori-Donati P, Fondelli M P, Cama A, Garrè M L, Rossi A, Andreussi L
Department of Neuroradiology, Children's Hospital Giannina Gaslini, Genoa, Italy.
Neuroradiology. 1995 Apr;37(3):238-43. doi: 10.1007/BF01578265.
We studied nine children with posterior cranial fossa ependymomas to identify specific neuroradiological features. Patients were studied preoperatively with CT and MRI; T1-, T2- and proton-density (PD)-weighted images were obtained. All children underwent surgery and a definite histopathological diagnosis was made. All the tumours grew into the fourth ventricle and caused dilatation of its upper part, which resembled a cap. All but one were separated from the vermis by a cleavage plane. In eight cases there was desmoplastic development through the foramina of the fourth ventricle, and five were heterogeneous due to necrosis and cystic change; one had a haemorrhagic area. In most cases the solid portion was isointense with grey matter on T1-weighted images, hyperintense on PD weighting, and isointense on T2-weighted images. On CT the tumour was isodense in six cases and calcification was detected in four. The presence of both desmoplastic development and a tumour/vermis cleavage plane in a posterior cranial fossa tumour isodense on CT is highly suggestive of ependymoma.
我们研究了9例后颅窝室管膜瘤患儿，以确定其特定的神经放射学特征。术前对患者进行了CT和MRI检查；获取了T1加权、T2加权和质子密度（PD）加权图像。所有患儿均接受了手术，并做出了明确的组织病理学诊断。所有肿瘤均生长至第四脑室并导致其上部分扩张，类似帽状。除1例之外，其余所有肿瘤均通过一个分离平面与蚓部分开。8例中存在通过第四脑室孔道的促结缔组织增生性改变，5例因坏死和囊性变而表现为不均质；1例有出血区。在大多数病例中，实性部分在T1加权图像上与灰质等信号，在PD加权图像上呈高信号，在T2加权图像上呈等信号。CT上，6例肿瘤呈等密度，4例检测到钙化。CT表现为等密度的后颅窝肿瘤中，若同时存在促结缔组织增生性改变和肿瘤/蚓部分离平面，则高度提示室管膜瘤。
