Lee Y Y, Van Tassel P, Bruner J M, Moser R P, Share J C
Department of Diagnostic Radiology, University of Texas M. D. Anderson Cancer Center, Houston 77030.
AJR Am J Roentgenol. 1989 Jun;152(6):1263-70. doi: 10.2214/ajr.152.6.1263.
Thirty-seven cases of juvenile pilocytic astrocytoma were reviewed retrospectively to determine their CT and MR characteristics. All cases occurred in pediatric patients, except for one in a young adult. There was a propensity for tumors to be located around the third and fourth ventricles. On CT the tumors were all sharply demarcated and smoothly marginated and rarely had associated edema. The lesions tended to be round or oval. The tumor matrix was most often hypo- or isodense with marked enhancement. Cyst formation, either micro- or macrocystic or combined, was frequently observed, and tumor calcification occurred occasionally. On MR the tumors appeared hypo- or isointense on T1-weighted images and hyperintense on T2-weighted images. The radiologic appearances of juvenile pilocytic astrocytomas are quite characteristic. By using age of presentation, typical location, configuration, and enhancement patterns, the presurgical diagnosis of juvenile pilocytic astrocytoma can be made with a high index of confidence.
回顾性分析37例青少年毛细胞型星形细胞瘤的CT和MR特征。除1例发生于青年外，所有病例均发生于儿科患者。肿瘤倾向于位于第三和第四脑室周围。CT上，肿瘤边界均清晰，边缘光滑，很少伴有水肿。病变多呈圆形或椭圆形。肿瘤基质多为低密度或等密度，强化明显。常可见微囊、大囊或混合性囊肿形成，偶尔可见肿瘤钙化。MR上，肿瘤在T1加权像上呈低信号或等信号，在T2加权像上呈高信号。青少年毛细胞型星形细胞瘤的影像学表现颇具特征性。通过结合发病年龄、典型部位、形态及强化方式，术前诊断青少年毛细胞型星形细胞瘤的准确性较高。
