Ventriculomegaly possible hydrocephalus. There is a redemonstration of a large ventricles with extensive loss of cortical mantle. The left lateral ventricle is massively enlarged relative to the right lateral ventricle which is also enlarged. There is a septation within the left lateral ventricle and this could also represent porencephaly. The general appearance is is similar to prior exams. A ventriculostomy tube courses through the left frontal bone into the left lateral ventricle. At the level of the top of the right lateral ventricle the diameter of a left-sided ventricle measures and 67 mm in diameter and on the prior MRI exam measured 42 mm in diameter, however, the head is significantly larger currently than on the prior exam and probably related to interval growth of the infant . At the level of the foramina of Monroe the right lateral ventricle measures 29 mm in diameter on the current exam and it measured 20 mm in diameter on the previous MRI exam the left lateral ventricle at this level measures 50 mm on the current exam and 35 mm on the prior exam the third ventricle is also enlarged and measures 22 mm in diameter; on the prior MR it measured 17 mm in diameter. The fourth ventricle is not dilated.In general the left calvarium appears larger than the right calvarium. On the current exam and the angled dimensions of the skull at the level of the top of the thalami are 172 x 132 mm and on the exam of 311/08 they were 85 x 120 mm and on the 8/7/08 exam they were 129 by 109 mm.
Marked enlargement of lateral ventricles and third ventricle left lateral ventricle more than right. Since the previous examination the lateral ventricles and third ventricle have enlarged however so has the head.