MRI appearences of pilomyxoid astrocytoma at unusual sites in children
10.3969/j.issn.1002-1671.2018.12.026
- VernacularTitle:儿童不典型部位毛细胞黏液样型星形细胞瘤的MRI表现
- Author:
Xingxing LÜ
1
;
Xinrong ZHANG
;
Hongmei GUAN
;
Xue'e CHAI
;
Xiaojun ZHANG
Author Information
1. 南京医科大学附属儿童医院放射科
- Keywords:
children;
astrocytoma;
brain tumor;
magnetic resonance imaging
- From:
Journal of Practical Radiology
2018;34(12):1918-1921
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the MRI manifestations of pilomyxoid astrocytoma (PMA)at unusual sites and differential diagnosis in children.Methods The clinical and MRI data from 6 cases of PMA with atypical locations confirmed by surgery and pathology were analyzed retrospectively.Results 2 cases located at cerebral hemisphere,1 case at tegmentum mesencephali,1 case at medulla and 2 cases at cerebellar hemisphere.There were 4 cases of solid tumor and 2 case belonged to cystic-solid mass.5 cases were round or oval and 1 case was shallow lobulated.In addition,there were 2 cases with hemorrhage and 2 cases with peritumoral edema.T1WI showed hypointensity,isointense or slightly hyperintense while T2WI and fluid attented inversion recovery (FLAIR)exhibited isointensity or hyperintensity.After contrast administration,there were 3 cases of obvious multi-ring enhancement,of which 1 case showed astral enhancement of the mural nodules and the other 3 cases showed mild homogeneous or inhomogeneous enhancement.4 cases showed non-enhanced areas in the solid parts.No signs of leptomeningeal dissemination were found in all 6 cases.Conclusion The PMA at unuaual sites in children is primarily solid or cystic-solid,and the image manifestations of plain scan are varied.After enhancement,the tumors show obviously multi-circular enhancement and mild homogeneous or inhomogeneous enhancement could be observed,no enhancement areas are visible in the solid parts.It is noteworthy to distinguish this astrocytoma from other lesions.
