MR imaging study on external hydrocephalus in infants: extracerebral space developmental and pathological enlargement
- VernacularTitle:婴幼儿脑外积液的MRI研究:脑外间隙发育性与病理性的扩大
- Author:
Xiaoming WANG
;
Qiyong GUO
;
Nan LIN
;
Liying CHEN
- Publication Type:Journal Article
- Keywords:
Hydrocephalus;
Infant,newborn,disease;
Magnetic resonance imaging
- From:
Chinese Journal of Radiology
2001;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the characteristics of external hydrocephalus in infancy with MR imaging,and to explore the cause of accumulation of extracerebral fluid and the relation with brain development.Methods Conventional magnetic resonance T_1 weighted imaging(T_1WI) and T_2 weighted imaging(T_2WI) were performed in 46 infants aged 2 years or younger with external hydrocephalus(EH),and the results were analyzed.They were divided into 7 age groups.The width of extracerabral space was measured on T_2WI and compared with normal standard.Results EH mainly resulted from infection,subdural hematoma or subarachnoid hemorrhage,HIE,which were 67.4%(31/46 cases) of the cases;EH with unknown cause were 26.1%(12/46 cases).EH was mainly located at the foreside of cerebral convexity,of which 80.4%(37/46 cases)was predominantly in the subarachnoid space,8.7%(4/46 cases) in subdural space,10.9% was subdural coexisted with subarachnoid collection.Duramater and piamater were high signal on T_1WI or T_2WI in purulent meningitis,and subdural or coexisted with subarachnoid collection often occurred.In subdural and(or) subarachnoid hematoma,subdural collection commonly coexisted with subarachnoid collection,and the cerebral cortical veins were often seen thickened diameter,stasis and hemorrhage with high signals on T_1WI.HIE caused subarachnoid collection,63.6%(7/11 cases) of which were concurred with delayed myelination.EH with unknown cause often appeared bilateral symmetrical subarachnoid collection.Enlargement of ventricular size were predominantly seen in HIE,subdural hematoma or subarachnoid hemorrhage.Conclusion EH often had definite etiological factor,which were mainly hemorrhage,infection and HIE.The location was associated with brain development.MR imaging was useful for judging reason and ascertaining character of EH.
