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Unilateral Ventriculomegaly or Congenital Unilateral Ventricular Dilatation

Bezbaruah Naba Kumar


The lateral ventricles may be larger than normal in one side or both sides. Usually it is 10 mm or less in normal foetus during routine antenatal ultrasonogram at the level of atrium. Atrium is the larger central area in lateral ventricle where the three horns anterior, posterior and inferior horns meet together. The present case is having unilateral dilated right ventricle in the mid trimester which is followed upto the age of three years and proving to be a normal child with still right ventricle larger than left. True ventriculomegaly may be associated with other congenital malformations, can be a manifestation of genetic or chromosomal defects, may be due to infections like cytomegalovirus, rubella, toxoplasma etc. The ruling out of all the factors and to prove the foetus a normal one is a challenge to the medical fraternity. Unable to get a conclusion in the antenatal period itself can lead to serious agony to the parents and family which may lead to untoward outcome. The present case is one where there was a weak suspicion of true ventriculomegaly with agony persisting in parents to require intervention but it proved itself to be a normal one which is only can be regarded as a normal variation.


Keywords: Interventricular foramen, ventriculomegaly, atrium, genetic defects, hydrocephalus, antenatal ultra sonogram, congenital isolated ventricular dilatation, diagnostic challenge

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