Patient presents with ventriculomegaly, defined as enlargement of cerebral ventricles.  Assessment includes evaluation for hydrocephalus, increased intracranial pressure, and underlying causes such as congenital abnormalities, including Dandy-Walker malformation and Chiari malformation.  Fetal ventriculomegaly may be detected on prenatal ultrasound.  Infant ventriculomegaly signs and symptoms can include macrocephaly, bulging fontanelle, developmental delays, and seizures.  Diagnostic workup may involve head ultrasound, cranial MRI, and CT scan to measure ventricular size, assess brain parenchyma, and identify potential obstructions in cerebrospinal fluid (CSF) flow.  Differential diagnosis includes benign external hydrocephalus and hydrocephalus ex vacuo.  Treatment for ventriculomegaly depends on the underlying etiology and severity, ranging from observation and monitoring to surgical interventions such as ventriculoperitoneal shunting for managing hydrocephalus.  Prognosis varies based on cause, severity, and timely intervention.  Genetic counseling may be indicated in cases of suspected genetic disorders.  Follow-up care includes regular neurodevelopmental assessments and imaging studies to monitor ventricular size and assess treatment efficacy.  ICD-10 code Q03.9 is typically used for unspecified congenital hydrocephalus, and additional codes may be necessary to specify etiology or associated conditions.  CPT codes for related procedures, such as imaging and neurosurgical interventions, should be documented appropriately for billing purposes.