Objective To investigate the morphological changes and prognosis of fetal arachnoid cyst with gestational age and postpartum age by MRI.Methods We condncted retrospective comparison to 18 follow-up cases of fetal archnoidal cysts by MRI before and after birth.The location,morphology and the relationship of surrounding brain parenchyma of fetal arachnoid cyst were observed in different fetal period to evaluate the prognosis.Results There were 10 arachnoid cysts cases located un-der the tentorium of the cerebellum,including 1 case in the right cerebellomedullary cistern,1 case in the right of quadrigeminal cistern,2 cases behind the right cerebellar hemisphere,1 case below the left cerebellar hemisphere,and 5 cases in the middle line of the posterior fossa.There were 8 arachnoid cysts cases located up the tentorium of the cerebellum,including 1 case in the cavum velum interpositum,1 case in the right supratentorial cerebellum,and 3 cases respectively in the right and left temporal pole.In 18 follow-up cases,15 fetuses were followed up after birth,and 3 were followed up twice during fetal period,but not post-partum follow-up.11 cases arachnoid cysts were gradually enlarged,of which only 1 case was enlarged in the middle line of pos-terior fossa.4 cases with progressive hydrocephalus were found after the birth,3 cases occurred deviating from midline and 1 case was located in the middle sail cavity.Conclusions The outcome of fetal arachnoid cyst is different due to different location.Some arachnoid cysts tend to increase with gestational age and age,and the arachnoid cysts that deviate from the midine are more prone to progressive enlargement.The growth rate,compression of adjacent brain tissue and ventricular obstruction in fetal pe-riod are slower than that in postpartum period.
关键词
磁共振成像/胎儿/蛛网膜囊肿/随诊
Key words
Magnetic Resonance Imaging/Fetus/Arachnoid cyst/Follow-up
维普
万方数据