Neonatal periventricular-intraventricular hemorrhage. Subacute and chronic MR findings.

AbstractPurpose: To evaluate MR findings at subacute and chronic stages after neonatal periventricular-intraventricular hemorrhage (PIVH), and to determine the clinical significance of follow-up MR.Material and Methods: Twenty-six children (estimated gestational age, 23-39 weeks; mean 29 weeks) with a history of previous PIVH underwent MR examination during their subacute and chronic clinical courses. PIVHs were initially detected with ultrasound examination in all cases. PIVH was divided into three grades (mild, moderate, and severe) according to the findings at the initial US studies, which were correlated to the MR findings.Results: Abnormal signal intensities related to hemorrhage were demonstrated in 10 of 21 patients (47.6%) on initial MR studies; the very low signal intensities on T2-weighted images found on the periventricular wall with a linear or a spotty shape had disappeared at one year after the initial US. The children with ventriculomegaly and periventricular leukomalacia (PVL) were increas...