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AJR 2001; 177:1483-1484
© American Roentgen Ray Society

Contrast-Enhanced MR Angiography of Endovascular Stents

An Oversight in Citation?

Richard Tello and Ken R. Thomson

Boston University Boston, MA 02118
Alfred Hospital Monash University Prahran, Victoria, Australia

It is with interest that we read the recent article by Juergens et al. [1], "Three-Dimensional Contrast-Enhanced MR Angiography of Endovascular Covered Stents in Patients with Peripheral Arterial Occlusive Disease." We note that our prior work has shown not only the usefulness of contrast-enhanced MR angiography in patients before and after stent evaluation [2], but also that the procedure can be readily done in vivo, with IV [3] or intraarterial [4] gadolinium administration. It is unfortunate that none of our work, which preceded that of Link et al. [5], was cited in the article.

References

  1. Juergens KU, Tombach B, Reimer P, Vestring T, Heindel W. Three-dimensional contrast-enhanced MR angiography of endovascular covered stents in patients with peripheral arterial occlusive disease. AJR 2001;176:1299 -1303[Abstract/Free Full Text]
  2. Tello R, Thomson KR, Witte D, Becker GJ, Tress BM. Standard dose Gd-DTPA dynamic MR of renal arteries. J Magn Reson Imaging 1998;8:421 -426[Medline]
  3. Tello R, Thomson KR, Witte D, Becker GJ, Tress BM. Dynamic gadolinium DTPA-enhanced magnetic resonance of intravascular stents. Invest Radiol 1998;33:411 -415[Medline]
  4. Tello R, Mitchell PJ, Melhem ER, Witte D, Thomson KR. Interventional catheter magnetic resonance angiography with a conventional 1.5-T magnet: work in progress. Australas Radiol 1999;43:435 -439[Medline]
  5. Link J, Steffens JC, Brossmann J, Graessner J, Hackethal S, Heller M. Iliofemoral arterial occlusive disease: contrast enhanced MR angiography for preinterventional evaluation and follow-up after stent placement. Radiology 1999;212:371 -377[Abstract/Free Full Text]

Reply

An Oversight in Citation?

Kai Uwe Juergens, Bernd Tombach and Peter Reimer

University Hospital of Muenster D-48129 Muenster, Germany

We thank Tello and Thomson for their interest in our in vitro and in vivo work [1]. Indeed, those authors investigated the MR imaging of Palmaz stents in renal artery stenosis in seven patients and reported a signal void caused by this type of stent [2].

The purpose of our study was to evaluate the in vitro and in vivo imaging characteristics, endoluminal patency, and appearance of perigraft reactions after percutaneous placement of a new endovascular covered stent (Hemobahn; Gore, Putzbrunn, Germany) in patients suffering from peripheral artery occlusive disease that had not been evaluated by MR imaging or three-dimensional contrast-enhanced MR angiography before our study. Therefore, our work has a different focus than that of Tello and Thomson [2].

Furthermore, Hemobahn devices consist of an expanded polytetrafluoroethylene graft with an external nitinol support, whereas stainless steel is the underlying material of Palmaz stents [3]. Because of the well-known lower susceptibility to artifacts in that type of stent, our MR investigation was performed using Hemobahn devices.

References

  1. Juergens KU, Tombach B, Reimer P, Vestring T, Heindel W. Three-dimensional contrast-enhanced MR angiography of endovascular covered stents in patients with peripheral arterial occlusive disease. AJR 2001;176:1299 -1303
  2. Tello R, Thomson KR, Witte D, Becker GJ, Tress BM. Standard dose Gd-DTPA dynamic MR of renal arteries. J Magn Reson Imaging 1998;8:421 -426
  3. Hilfiker PR, Quick HH, Debatin JF. Plain and covered stent-grafts: in vitro evaluation of characteristics at three-dimensional MR angiography. Radiology 1999;211:693 -697[Abstract/Free Full Text]

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This Article
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