Dynamic 3-D contrast-enhanced angiography of cerebral tumours and vascular malformations

AbstractVascular lesions of the hand are common and are distinct from vascular lesions elsewhere because of the terminal vascular network in this region, the frequent hand exposure to trauma and microtrauma, and the superficial location of the lesions. Vascular lesions in the hand may be secondary to local pathology, a proximal source of emboli, or systemic diseases with vascular compromise. In most cases, ischaemic conditions are investigated with Doppler ultrasonography. However, computed tomography angiography (CTA) or dynamic contrast-enhanced magnetic resonance angiography (MRA) is often necessary for treatment planning. MR imaging is frequently performed with MRA to distinguish between vascular malformations, vascular tumours, and perivascular tumours. Some vascular tumours preferentially affect the hand, such as pyogenic granulomas or spindle cell haemangiomas associated with Maffucci syndrome. Glomus tumours are the most frequent perivascular tumours of the hand. The purpose of this article is to describe the state-of-the-art acquisition protocols and illustrate the different patterns of vascular lesions and perivascular tumours of the hand.

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MRA Mapping and Selective Embolization of a Large Uterine Cavity Pseudoaneurysm at 20 Weeks of Gestation

Case Reports in Obstetrics and Gynecology ◽

10.1155/2018/3610492 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7

Author(s):

Jean V. Storey ◽

Timothy B. Dinh ◽

Deirdre M. McCullough ◽

Steven H. Craig ◽

Christian L. Carlson

Keyword(s):

Magnetic Resonance ◽

Magnetic Resonance Angiography ◽

Mortality Risk ◽

Vascular Malformations ◽

Uterine Cavity ◽

Massive Hemorrhage ◽

Fetal Mortality ◽

Intravenous Contrast ◽

Selective Embolization ◽

Contrast Enhanced

Antepartum uterine cavity pseudoaneurysm rupture can cause massive hemorrhage with high maternal and fetal mortality risk. Invasive placentation can predispose to vascular malformations. We present a novel use of macrocyclic intravenous contrast-enhanced magnetic resonance angiography for preprocedure planning followed by selective low radiation embolization of a uterine cavity pseudoaneurysm in the setting of invasive placentation at 20 weeks of gestation. To our knowledge, this is the first reported case of uterine cavity pseudoaneurysm successfully mapped with MRA and treated with embolization at 20 weeks of gestation.

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Accuracy of percentage of signal intensity recovery and relative cerebral blood volume derived from dynamic susceptibility-weighted, contrast-enhanced MRI in the preoperative diagnosis of cerebral tumours

The Neuroradiology Journal ◽

10.1177/1971400915611916 ◽

2015 ◽

Vol 28 (6) ◽

pp. 574-583 ◽

Cited By ~ 5

Author(s):

Ananya Chakravorty ◽

Timothy Steel ◽

Joga Chaganti

Keyword(s):

Blood Volume ◽

Signal Intensity ◽

Preoperative Diagnosis ◽

Cerebral Blood Volume ◽

Dynamic Susceptibility ◽

Cerebral Tumours ◽

Enhanced Mri ◽

Relative Cerebral Blood Volume ◽

Contrast Enhanced ◽

Contrast Enhanced Mri

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3T MRI of Peripheral Vascular Malformations: Characteristics and Comparison of Two Fat-Saturated sequences: Short Tau Inversion Recovery Versus Three-Dimensional High-Resolution Volume Interpolated Gradient Recalled Echo

RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren ◽

10.1055/a-1253-8422 ◽

2020 ◽

Cited By ~ 1

Author(s):

Florentine Höhn ◽

Simone Hammer ◽

Claudia Fellner ◽

Florian Zeman ◽

Wibke Uller ◽

...

Keyword(s):

Magnetic Resonance ◽

High Resolution ◽

Vascular Malformations ◽

Three Dimensional ◽

High Flow ◽

Low Flow ◽

Peripheral Vascular ◽

Contrast Enhanced ◽

Hemodynamic Characteristics ◽

Short Tau Inversion Recovery

Purpose To assess morphological and hemodynamic characteristics of peripheral vascular malformations on 3 T magnetic resonance imaging (MRI) including qualitative comparison of two fat-saturated sequences: short tau inversion recovery (STIR) and three-dimensional high-resolution volume interpolated gradient recalled echo (GRE). Materials and Methods During 9 months, 100 patients with suspected or known vascular malformations were prospectively assessed on a 3 T scanner using T2-weighted STIR and turbo spin echo (TSE), T1-weighted TSE, time-resolved contrast-enhanced magnetic resonance angiography (MRA) with interleaved stochastic trajectories (TWIST) and T1-weighted volume interpolated breath-hold examination (VIBE) after contrast enhancement. The analysis included signal behavior and morphologic and hemodynamic characteristics. Additionally, the image quality of the fat-saturated sequences was evaluated by 2 radiologists. Results 86 patients (14 dropouts; 57 female, 29 male; mean age 26.8 years, age range 1–56) were analyzed. 22 had high-flow and 64 low-flow malformations, including 14 with a lymphatic component. In 21 of 22 patients with high-flow malformations, typical characteristics (flow voids, hyperdynamic arteriovenous fistula, dilated main/feeder-arteries and draining veins) were documented. Patients with low-flow malformations had phleboliths in 35 cases, fluid-fluid levels in 47 and dilated draining veins in 23. Lymphatic malformations showed peripheral contrast enhancement of cyst walls in the volume interpolated GRE. The comparison of fat-saturated sequences showed significantly better results of the volume interpolated GRE in all categories except the presence of artifacts which were significantly reduced in the STIR (p < 0.05). Conclusion 3 T MRI with MRA provides detailed morphological and hemodynamic information of different types of peripheral vascular malformations. Contrast-enhanced high-resolution volume interpolated GRE proved superior to STIR in differentiating morphologic features and to be diagnostic in the differentiation of lymphatic parts and joint involvement. Key Points: Citation Format

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