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Neuroradiology

, Volume 57, Issue 10, pp 999–1006 | Cite as

Frequency and appearance of hemosiderin depositions after aneurysmal subarachnoid hemorrhage treated by endovascular therapy

  • Bernhard Falter
  • Martin Wiesmann
  • Jessica Freiherr
  • Omid Nikoubashman
  • Michael Mull
Diagnostic Neuroradiology

Abstract

Introduction

It is still unclear how often subarachnoid hemorrhage (SAH) leads to chronic hemosiderin depositions. In this study, we aimed to determine the frequency of chronic hemosiderin depositions after aneurysmal SAH in patients who did not undergo surgery. Furthermore, we analyzed typical MRI patterns of chronic SAH and sought to obtain information on the temporal course of MRI signal changes.

Methods

We retrospectively analyzed 90 patients who had undergone endovascular treatment for acute aneurysmal SAH. In all patients, initial CT studies and at least one T2*-weighted MRI obtained 6 months or later after SAH were analyzed for the presence and anatomical distribution of SAH or chronic hemosiderin depositions. In total, 185 T2*-weighted MRI studies obtained between 2 days and 148 months after SAH were evaluated (mean follow-up 30.2 months).

Results

On MRI studies obtained later than 6 months after SAH, subpial hemosiderin depositions were found in 50 patients (55.5 %). Most frequent localizations were the parenchyma adjacent to the frontal and parietal sulci and the insular cisterns. While the appearance of hemosiderin depositions was dynamic within the first 3 months, no changes were found during subsequent follow-up. MR signal changes were not only conclusive with subarachnoid hemosiderin depositions but in many cases also resembled those that have been associated with cortical hemosiderosis.

Conclusions

T2*-weighted MRI is an effective means of diagnosing prior SAH. Our study suggests that chronic hemosiderin depositions can be found in a considerable number of patients after a single event of subarachnoid hemorrhage.

Keywords

Hemosiderin Endovascular therapy T2*w magnetic resonance imaging Subarachnoid hemorrhage Aneurysm 

Notes

Ethical standards and patient consent

We declare that all human and animal studies have been approved by the Ethics Committee of the Faculty of Medicine at RWTH Aachen University and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. We declare that all patients gave informed consent prior to inclusion in this study.

Conflict of interest

We declare that we have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Bernhard Falter
    • 1
  • Martin Wiesmann
    • 1
  • Jessica Freiherr
    • 1
  • Omid Nikoubashman
    • 1
  • Michael Mull
    • 1
  1. 1.Department of NeuroradiologyUniversity Hospital Aachen RWTHAachenGermany

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