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18 Major Blood Vessels
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Fig. 18.3 Abdominal aorta after endovascular aortic aneurysm repair complicated with type II endoleak. The arterial phase transverse CEUS image. The lumbar artery
is detected posteriorly to the stent-graft (type II endoleak). Perfused iliac segments of the stent-graft are also observed
Fig. 18.4 Abdominal aorta after endovascular aortic aneurysm repair complicated with type II endoleak from the inferior mesenteric artery. Transverse CEUS image. (a) The early arterial phase. Contrast enhancement of the
peripheral aspects of the aortic aneurysm sac ventrally from the perfused stent-graft. (b) Gradual enhancement aortic aneurysm sac in the late arterial phase
CEUS is also feasible to follow up the patients after various endovascular interventions, such as stenting the iliac arteries. It is capable to detect the complications when the imaging conditions are too poor for the conventional US with Doppler
imaging and other imaging modalities are not applicable (Fig.18.5).
One useful CEUS feature is the reliable dif­ferentiation of retroperitoneal cystic lesions from blood vessels (Fig.18.6).
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M. G. Tukhbatullin et al.
a
b
Fig. 18.5 The thrombosis of the stent in the aneurysm of the external iliac artery. The arterial phase CEUS images. (a) The aneurysm of the external iliac artery with nonoc­clusive thrombus and a partially occluded stent. The stent has an enhancement defect (arrow), the enhanced blood
bypasses the occluded segment of the stent via the aneu­rysm sac. Scan along the iliac vessels. (b) The aneurysm sac with concentric thrombus and the enhanced central aspects. Occluded stent (arrow). Transverse image
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a
b
c
Fig. 18.6 The cyst of the retroperitoneal space. (a) Grayscale sonography. The anechoic lesion with clear smooth boundaries is detected adjacent to the abdominal aorta (arrow). (b). CEUS image, the arterial phase. The
Visceral artery aneurysms are rare entities. One example is the gastroduodenal artery aneu­rism, which accounts for 3.5% of all aneurysms of visceral arteries [9]. False aneurysms are dif­ferent from true ones and may result from trauma and other causes. However, some of them typi­cally arise in patients with chronic pancreatitis. Chronic pancreatitis often develops cysts, which cannot resolve by themselves. Large-sized (>5cm) pancreatic cyst compresses the surround­ing structures and if affects the adjacent artery results in periarterial inammation, necrosis of the wall, and the development of the stula between the artery and cystic lumen [912] (Fig.18.7).
lesion is nonenhanced (arrow). (c) CE-CT identies a nonenhancing retroperitoneal lesion of uid density (arrow)
Aneurysm of the internal carotid artery along with atherosclerotic plaques may cause a tran­sient ischemic attack or acute ischemic stroke. The extracranial carotid artery aneurysm is quite rare and accounts for 1–2% of all abnormalities [13] (Fig.18.8).
Atherosclerotic lesions of the carotid arteries are currently widely diagnosed with Doppler sonography. It precisely determines the degree and length of the stenosis, structure of atheroscle­rotic plaque, and the condition of its surface. The data obtained with duplex scanning comprise the basis for the classication of atherosclerotic plaques, which pays special attention to the signs of instability. High-grade stenosis and certain
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b
Fig. 18.7 A false aneurysm of the gastroduodenal artery in the pancreatic head cyst. The status after stenting of the common hepatic artery. (a) The arterial phase CEUS image demonstrates a gradual inow of microbubbles into the false aneurysm sac, which is located in the otherwise
nonenhanced pancreatic head cyst. The common hepatic artery stent (arrow) is enhanced. (b) CE-CT demonstrates the connection of the pseudoaneurysm with the gastrodu­odenal artery (arrow)
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a
b
c
Fig. 18.8 False aneurysm of the right internal carotid artery. (a) Grayscale with CDI sonography reveals the artery kinking. (b). The arterial phase CEUS image dem-
plaque structure features, such as ulceration or large hypoechoic area under the surface, indicate the transition of the stable plaque to an unstable condition. Unstable atherosclerotic plaques are associated with a high risk of thrombosis and embolism of distal branches, which can lead to a stroke [1417].
onstrates the enhancement of the aneurism sac. (c) Volumetric representation of CE-CT of the same lesion
From the point of view of pathology, this tran­sition is a consequence of the progressive inam­mation of the vascular wall. It implicates the increase in the density of vasa vasorum and neo­vascularization of the atherosclerotic plaque [18,
19]. The clinical manifestation of the plaque is
associated with prominent neovascularization.
322
Fig. 18.9 Atherosclerotic plaque in the internal carotid artery. The arterial phase CEUS image demonstrates a regular cap and avascular structure of the plaque (arrow)
M. G. Tukhbatullin et al.
Currently, there is an opinion that vasa vasorum within the plaque is an independent predictor of hemorrhage and plaque rupture with possible embolism [17]. Therefore, neovascularization is considered in determining the indications and type of surgical intervention in addition to the grade of stenosis, the plaque composition features, and the state of the surface of the atherosclerotic plaque.
The use of UCAs provides new opportunities for the diagnosis of atherosclerotic lesions. It sig­nicantly improves the imaging of the vascular lumen regardless of the angle and scanning plane. CEUS enables the detection of local brous cap ulceration and increased neovascularization of the plaque. Besides, it is more accurate in the estima­tion of the degree and geometry of stenosis.
To assess the plaque neovascularization, the
following grades may be used [20]:
• Grade 0: no appearance of neovascularization within the plaque (Fig.18.9)
• Grade 1: the limited appearance of neovascu­larization within the plaque
• Grade 2: moderate neovascularization (Figs.18.10 and 18.11)
• Grade 3: the presence of a pulsating arterial vessel within the plaque
Therefore, CEUS is a promising non-invasive
method for the diagnosis of vascular pathologies, which facilitates risk assessment and the choice of management strategy.
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b
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c
Fig. 18.10 Atherosclerotic plaque of carotid bifurcation with the transition to the external carotid artery and the proximal segment of the internal carotid artery. (a) Grayscale sonography. (b) CDI. (c) CEUS image demon-
strates the enhancement of the arterial lumen with the improved delineation of the geometry and length of the stenotic area. Pronounced asymmetric accumulation of microbubbles within the plaque is identied
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M. G. Tukhbatullin et al.
Fig. 18.11 Atherosclerotic plaque with prominent neo­vascularization. CEUS images demonstrate progressive inow of UCA into the plaque. (a) Multiple neovessels are visualized within the plaque in the arterial phase. The

References

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CEUS forMinimally Invasive Procedures: Intracavitary CEUS
YuryN.Patrunov , InnaA.Apolikhina , EllaI.Peniaeva , AlexanderN.Sencha , andAynaS.Saidova
19
Ultrasound monitoring of interventional proce­dures with microbubble injection has many advantages over traditional US, CT, or MRI and assumes both intravenous and intraluminal UCA administration. Microbubble contrast media can be introduced into any physiological or patho­logical cavity of the body to estimate its compo­sition, potential stula, the position of the drainage system, patency of a hollow organ or duct (e.g., fallopian tubes, biliary system, or reux detection), etc. [17]. CEUS is feasible for the identication of viable tumor tissue to guide biopsies and monitor ablative techniques, such as radiofrequency or thermal ablation [812].
The EFSUMB guidelines and recommenda­tions for the clinical practice of CEUS in non­hepatic applications (2017) advise intravenous UCA injection to assist interventional procedures and achieve the following goals [13]:
Supplementary Information The online version con­tains supplementary material available at [https://doi.
org/10.1007/978- 3- 030- 91764- 7_19].
• to delineate the abscess cavity or necrotic area for efcient drainage
• to avoid necrotic tissue or identify perfused tissue in the biopsy of tumors
• to identify biopsy targets inconspicuous on US
• to manage patients treated with ablation therapies
Intracavitary CEUS is useful for the following
purposes, optionally supplemented by intrave­nous CEUS [13]:
• identication of needle or catheter position
• delineation of any cavity or duct
• improved tracking of a stula
Intracavitary CEUS may contribute to many
minimally invasive diagnostic or therapeutic modalities, such as listed below [13]:
Y. N. Patrunov (*) · E. I. Peniaeva Department of Ultrasound Diagnostics of the Center for Radiological Diagnostics, Private Healthcare Institution “Clinical Hospital “RZD-Medicina” of Yaroslavl City”, Yaroslavl, Russian Federation
I. A. Apolikhina · A. S. Saidova Department of Aesthetic Gynecology and Rehabilitation, Federal State Budget Institution “National Medical Research Center for Obstetrics,
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2022 A. N. Sencha, Y. N. Patrunov (eds.), Contrast-Enhanced Ultrasound,
https://doi.org/10.1007/978-3-030-91764-7_19
Gynecology and Perinatology n.a. V.I.Kulakov”, Moscow, Russian Federation
A. N. Sencha Department of Visual and Functional Diagnostics, Federal State Budget Institution “National Medical Research Center for Obstetrics, Gynecology and Perinatology n.a. V.I.Kulakov”, Moscow, Russian Federation
327