![]() Contrast-enhanced MRI was the sequence of choice for depiction of DVAs. We identified the detailed characteristics of DVAs using enhanced MRI. In our study, all 32 DVAs were diagnosed using enhanced MRI without the assistance of other imaging techniques. 1) This appearance has been referred to as caput medusae (or the head of Medusa). 6) On contrast-enhanced MRI, the cluster of veins in DVAs has a spoke-wheel appearance the veins are small at the periphery and gradually enlarge as they approach a central draining vein. After the administration of gadolinium, significant enhancement of the medullary veins and venous collector is observed because of the slow flow. Similarly to CMs, low flow and low resistance almost always typify DVA hemodynamics. The collector vein is detected as a linear or small, round, signal-void structure on all sequences and is shown most clearly on T2-weighted imaging. 4) T1-weighted studies may yield normal results in the presence of small DVAs. Noncontrast T1- and T2-weighted MRI may demonstrate flow voids and phase-shift artifacts produced by the collecting vein of a DVA. The mean age was 38.1 11.On MRI, DVAs typically have a transhemispheric flow void, on both T1- and T2-weighted images. Categoric variables were compared using RESULTS: Forty-two patients with venous malformations were included. Data were collected on venous malformation location, developmental venous anomaly location, developmental venous anomaly drainage pattern, and metameric location of venous malformations and developmental venous anoma- tests. All images were interpreted by 2 neuroradiologists. Developmental venous anomaly prevalence in this patient population was compared with an age- and sex-matched control group without venous malformations at a ratio of 1:2. MATERIALS AND METHODS: A consecutive series of patients with head and neck venous malformations who underwent MR imaging of the brain with postcontrast T1- or T2*-weighted imaging were included. The purpose of this study was to determine whether there is an association between cerebral developmental venous anomalies and venous malformations of the face, head, and neck. Agid ABSTRACT BACKGROUND AND PURPOSE: A number of studies have demonstrated the existence of segmental vascular disorders affecting soft tissues of the head and neck along with the intracranial vasculature. ORIGINAL RESEARCH HEAD
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