The infant was awake and spontaneous breathing he presented bulging of the anterior fontanelle and enlargement of cranial sutures. The neonate was referred to pediatric neurosurgeons. Here, we present a case of prenatal diagnosis of unilateral hydrocephalus associated with stenosis of the foramen of Monro. Unilateral hydrocephalus is uncommon, and the prognosis depends on etiology and postnatal management The term unilateral hydrocephalus or monoventricular hydrocephalus specifically defines a single ventricle obstruction that by anatomical reasons can only indicate the involvement of the lateral ventricle, given that an obstruction of the third ventricle or fourth ventricles will necessarily cause biventricular and triventricular hydrocephalus, respectively. According to the number of ventricles involved, the hydrocephalus can be classified as unilateral or monoventricular (one ventricle involved) biventricular (two ventricles involved) triventricular (three ventricles involved) or tetraventricular hydrocephalus (all four ventricles involved). There are several causes of ventriculomegaly, with four main factors that can cause enlargement of the ventricles: a problem that prevents cerebrospinal fluid (CSF) from circulating, which causes hydrocephalus a minor imbalance in fluid circulation and absorption defects in brain development or damage or loss of brain tissue. Ventriculomegaly is classified according to the degree of dilatation as mild (10-12 mm), moderate (12-14 mm) or severe (≥15mm). It is characterized by dilatation of the lateral ventricles of the brain greater than 10 mm at the level of the atria.
Ventriculomegaly is one of the most common brain abnomally diagnosed during the fetal life.
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