Blighted ovum is characterised by :

Ans. is a i.e. Avascular villa According to the clinical and echographic findings, it is possible to separate early pregnancy losses into two groups : Blighted ova ; Those early pregnancy losses (before 12 weeks) in which fetal development is not observed with ultrasound (so that only a gestational sac is present with or without a yolk sac) and fetal tissue is absent on histologic examination of the products of conception. -ay Fetal demise : Those early pregnancy losses (occur after 12 weeks) in which fetal development is clearly observed by ultrasound and fetal tissue is found on the histologic examination. The difference between these two types of aboion is of fundamental impoance. The lack of development of fetal structures defines a subset of aboions of genetic origin. In contrast, the early interruption of fetal life is a complex phenomenon with multiple etiologies. Therefore, the couples with blighted ova do not require extensive work up, whereas patients who have aboed cytogenetically normal fetuses need an extensive search for non genetic factors responsible for the pregnancy loss.