Reason: evaluate structural abnormalities, enlarged ventricles History: macrocephaly, developmental delay, low muscle tone. There is no evidence of intracranial hemorrhage, mass, or acute infarct. No focal cortical lesions or parenchymal signal abnormalities are appreciated. The myelination pattern is within normal limits for age. The ventricles and basal cisterns are normal in size and configuration without evidence of hydrocephalus. No extra-axial collections are identified. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits and paranasal sinuses are grossly unremarkable. The mastoid air cells are grossly clear.
No focal structural abnormalities are identified. Specifically, no hydrocephalus or extra-axial collections to account for macrocephaly.