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AJNR Am J Neuroradiol. 2011 Dec;32(11):2030-6. doi: 10.3174/ajnr.A2687. Epub 2011 Sep 29.

Deep medullary vein involvement in neonates with brain damage: an MR imaging study.

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1
Department of Radiology and Neuroradiology, Children's Hospital V. Buzzi-Instituti Clinic di Perfezionamento, Milan, Italy. filippo.arrigoni@bp.lnf.it

Abstract

BACKGROUND AND PURPOSE:

Different and specific MR imaging patterns of lesions involving WM are widely defined in neonatal encephalopathy. The aim of this study was to describe a novel MR imaging pattern of damage characterized by the abnormal prominence of DMVs in premature and full-term neonates.

MATERIALS AND METHODS:

Twenty-one (11 premature and 10 full-term) neonates with MR imaging evidence of linear radially oriented fan-shaped lesions in the periventricular WM and without dural venous thrombosis were enrolled in this retrospective study. A total of 37 MR imaging examinations were performed at ages ranging from day 0 to 24 months.

RESULTS:

According to the appearance of linear anomalies on T2-weighted images, we identified 2 main patterns: T2 hypointense lesions without WM cavitations and T2 hypointense lesions associated with linear cysts. The first pattern was found in 17 examinations performed between 0 and 44 days of life; the second pattern was found in another 14 examinations performed between 6 days and 4 months of life. Five examinations performed between 9 and 24 months of life showed a reduction in volume and hyperintense signal intensity of the periventricular WM on T2-weighted and FLAIR images.

CONCLUSIONS:

Subtle linear WM lesions with the same anatomic distribution of DMVs may be evident in premature and full-term neonates without signs of major venous thrombosis, both in the acute and subacute phases. Their appearance and evolution suggest that transient DMV engorgement/thrombosis may be responsible for WM damage that can lead to a PVL-like pattern.

PMID:
21960491
DOI:
10.3174/ajnr.A2687
[Indexed for MEDLINE]
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