Isolated Fetal Ventriculomegaly- Postnatal Outcomes and Proposed New Prognostication Classification.

Background: Outcome of Isolated ventriculomegaly diagnosed antenatally depends on size of ventricles and associated malformations. There is scarcity of literature on the guidelines for prognostication based on outcomes as per the ventricle size.

Aim: The aim of this work was to study outcome of antenatally detected isolated ventriculomegaly in terms of medical termination, postnatal neuro-developmental milestones, and mortality; and also to propose a new prognostication classification.

Methods: Prospective and retrospective observational study on antenatal mothers with isolated ventriculomegaly diagnosed in fetus. Outcomes in terms of termination of pregnancy, postnatal mortality, need of surgery, and morbidity were recorded. Patients were categorized into four groups: Group 1--ventricle size <10 mm, II--11-15 mm, III--16-20 mm, and IV > 20 mm and neuro-developmental milestones were co-related. Association with chromosomal anomalies, congenital heart disease, and maternal infection were also analyzed.

Results: 521 antenatal females were referred with fetal anomalies with 163 having CNS malformations. Isolated ventriculomegaly was seen in only 44. Patients of groups 1 and 2 had 100% normal neuro-developmental milestones without any intervention. Group 3 patients had normal neurodevelopmental milestones in 60% only while shunt surgery was required in 40% of patients. All patients of group 4 had poor outcome with only 50% survival. No association with chromosomal anomalies and heart disease was found.

Conclusions: Prognosis of isolated ventriculomegaly depends upon size of ventricles and its progressive increase on serial ultrasounds. New proposed classification is simple and would be useful for the treating surgeons to explain the prognosis to parents so as to relieve them of anxiety.