title: Spontaneous development of bilateral subdural hematomas in an infant with benign infantile hydrocephalus: color Doppler assessment of vessels traversing extra-axial spaces.
abstract: We present an infant with macrocrania, who initially demonstrated prominent extra-axial fluid collections on sonography of the brain, compatible with benign infantile hydrocephalus (BIH). Because of increasing macrocrania, a follow-up sonogram of the brain was performed; it revealed progressive enlargement of the extra-axial spaces, which now had echogenic debris. Color Doppler US showed bridging veins traversing these extra-axial spaces, so it was initially thought that these spaces were subarachnoid in nature (positive cortical vein sign). However, an arachnoid membrane was identified superior to the cortex, and there was compression of true cortical vessels beneath this dural membrane. An MRI of the brain showed the extra-axial spaces to represent bilateral subdural hematomas. The pathogenesis of spontaneous development of the subdural hematomas, in the setting of BIH, is discussed. We also emphasize that visualizing traversing bridging veins through extra-axial spaces does not necessarily imply that these spaces are subarachnoid in origin.
authors.affiliation: Department of Radiology, New York University Medical Center, 560 1st Avenue, New York, NY 10016, USA. John.Amodio@med.nyu.edu
authors.forename: John
authors.initials: J
authors.lastname: Amodio
authors.forename: Vadim
authors.initials: V
authors.lastname: Spektor
authors.forename: Bidyut
authors.initials: B
authors.lastname: Pramanik
authors.forename: Rafael
authors.initials: R
authors.lastname: Rivera
authors.forename: Lynne
authors.initials: L
authors.lastname: Pinkney
authors.forename: Nancy
authors.initials: N
authors.lastname: Fefferman
mesh_terms: D001921:Brain / Q000098:blood supply; D002550:Cerebral Veins / Q000000981:diagnostic imaging*; D002675:Child, Preschool; D004453:Echoencephalography / Q000379:methods*; D046648:Hematoma, Subdural, Intracranial / Q000000981:diagnostic imaging* / Q000209:etiology*; D006801:Humans; D006849:Hydrocephalus / Q000150:complications* / Q000000981:diagnostic imaging*; D008297:Male; D009389:Neovascularization, Pathologic / Q000000981:diagnostic imaging / Q000209:etiology; D018615:Ultrasonography, Doppler, Color / Q000379:methods*