News | June 12, 2015

Aneurysms May Recur Years after Endovascular Treatment

Magnetic resonance angiography suggests incomplete occlusion and large lesions are risk factors for long-term recurrence

intracranial aneurysm, endovascular treatment, EVT, MRA, Naggara

June 12, 2015 - Endovascular treatment (EVT) of intracranial aneurysm is effective in preventing long-term bleeding, but may be followed by aneurysm recurrences in a significant proportion of cases, according to a study published online in the journal Radiology.

Intracranial aneurysm is a weak or thin spot in a blood vessel in the brain that balloons and fills with blood. It can leak or rupture, leading to a potentially fatal cerebral hemorrhage.

EVT with coils was developed in the 1990s and became an established treatment for intracranial aneurysm in the early 2000s. In EVT, coils are threaded via a micro-catheter through a blood vessel in the groin to the location of the aneurysm. The coils expand and cause formation of a clot in the aneurysm that provides a seal, or occlusion, to prevent further bleeding.

The main drawback of endovascular treatment is recanalization, or a return of blood flow into the original aneurysm. Previous studies on the clinical significance of this have followed a limited number of patients for relatively short periods.

For the new study, researchers looked at the long-term efficacy of EVT in preventing aneurysm ruptures. They performed clinical examination and 3-Tesla magnetic resonance angiography (MRA) 10 years after EVT of intracranial aneurysm in a single institution. In addition, they reviewed results from the medical literature to identify studies reporting bleeding and/or aneurysm recurrence rate in patients followed beyond 10 years after EVT.

Among 129 aneurysms followed for more than10 years, 16 (12.4 percent) demonstrated recanalization between midterm and long-term MRA. Incomplete occlusion on midterm MRA and retreatment within five years were risk factors for late recurrence. The literature review of 2,902 aneurysms showed that incomplete occlusion and aneurysm size of greater than 10 millimeters were risk factors for late recurrence.

The results show that while EVT is effective in preventing long-term bleeding, patients with larger aneurysms or incomplete occlusion face a long-term risk of aneurysm recurrences.

"This result is of importance since a large proportion of patients in the study were young, with a mean age of 47 years," said Olivier N. Naggara, M.D., Ph.D., from the Centre Hospitalier Sainte-Anne in Paris. "Consequently, demonstration of the efficacy of prevention of rupture more than 10 years after treatment is a crucial point."

If supported by additional research, the findings may mean that longer follow-up protocols are necessary for some intracranial aneurysm patients who undergo EVT.

"We believe that the subgroup of patients with aneurysm size 10 millimeters or more and patients with incomplete occlusions should be followed by noninvasive imaging exams for 10 years or more, particularly young patients," Naggara said.

EVT can be repeated to prevent a potential angiographic recurrence. However, more research is needed, Naggara said, to develop a clearer picture of the risks and benefits of this approach.

"Retreating a recurrent aneurysm with additional coils may fail in up to 50 percent of cases," he said. "Adjunctive techniques we add to standard coiling, such as modified coils, stents and flow diverters, have demonstrated lower recurrence rate after EVT but may involve more risks than simple treatment with platinum coils."

For more information: www.radiologyinfo.org

Related Content

Hitachi Healthcare Americas Introduces SynergyDrive MRI Workflow Solution
Technology | Magnetic Resonance Imaging (MRI) | November 21, 2017
November 21, 2017 — At the 2017 Radiological Society of North America (RSNA) annual meeting, Nov. 26-Dec.
Philips Azurion Image-Guided Therapy Platform Improves Clinical Workflow for Interventional Procedures
News | Angiography | November 15, 2017
Philips announced the results of a comprehensive, independent, two-year study demonstrating the clinical workflow...
Study Unveils Brain Changes During Extended Space Missions
News | Neuro Imaging | November 14, 2017
November 14, 2017 — More people today are poised to explore space than ever before; those who do will experience the
Synthetic CT Images Suitable for Prostate Cancer Radiotherapy Planning
News | Treatment Planning | November 14, 2017
Spectronic Medical announced that new data for their MRIPlanner software, generating synthetic computed tomography (sCT...
News | Magnetic Resonance Imaging (MRI) | November 13, 2017
Aspect Imaging announced last week that it received CE marking for the neonatal-dedicated Embrace Neonatal Magnetic...
Hitachi Healthcare Highlights Benefits of High-Field Open MRI in New Supplement

Click here to view the supplement.

News | Magnetic Resonance Imaging (MRI) | November 13, 2017
A new 24-page publication from Hitachi Healthcare details the benefits of High-Field Open MRI and is now available for...
Siemens Healthineers Introduces Share360 Tailored Service Portfolio
News | Imaging | November 10, 2017
November 10, 2017 — To address the specific needs of...
Johns Hopkins Researchers, Carestream Give Presentations on Medical Imaging Advances at RSNA
News | Digital Radiography (DR) | November 09, 2017
November 9, 2017 — Researchers from The Johns Hopkins University School of Medicine and Carestream Health scientists
3D CT image reconstruction of the thoracic organs and the heart using Philips software.
Sponsored Content | Webinar | Advanced Visualization | November 07, 2017
The CME webinar “Innovation and Success in 3D-inspired Development of the Business and Clinical Practice,” will take
Study Suggests Breast Cancer Patients Forego Post-Surgery Treatment Due to Mistrust
News | Radiation Therapy | November 06, 2017
November 6, 2017 — Nearly one-third of women with...
Overlay Init