Differentiating intrathecal catheter tip granulomas from normal magnetic resonance image distortion caused by metallic catheter tips

Stephen T. Magill, Paul Wang, Jorge L. Eller, Kim Burchiel

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

OBJECTIVE: To characterize the normal image distortion produced by metallic intrathecal catheter tips and define features that differentiate them from a catheter tip granuloma. METHODS: Three Medtronic Inc. (Minneapolis, MN) intrathecal catheter models (M8709, M8711, and M8731) were placed in a water-filled phantom, which was secured with a spinal coil and scanned with a 1.5-T magnetic resonance imaging (MRI) scanner. MRI scans from two patients receiving intrathecal opiate therapy without a granuloma and one patient with a granuloma were analyzed for comparison. RESULTS: All three catheter models produced a metallic susceptibility artifact, which distorted the local tissue image. The tip appeared as a round, dark void sandwiched between two bright bands in the sagittal plane. Axial views produced an oval-shaped, dark central void completely surrounded by a bright rim. On MRI scans, catheter tip diameter varied from 2.3 to 6.7 mm and tip length varied from 4.0 to 7.5 mm, which is a 74 to 480% increase over their actual size. The catheter tip appearance in the phantom correlated with the tip appearance in MRI scans from patients with intrathecal catheters. Images from a tip granuloma show a bright rim surrounding the catheter tip in the sagittal plane with or without contrast as well as postcontrast enhancement of the whole granuloma, and the catheter tip appeared greater than 5 mm in diameter and length. CONCLUSION: When evaluating possible granuloma development around an intrathecal catheter tip, it is important to take into account the characteristic metallic susceptibility artifact and increased size of normal metallic catheter tips on MRI scans.

Original languageEnglish (US)
Pages (from-to)242-248
Number of pages7
JournalNeurosurgery
Volume62
Issue number1
DOIs
StatePublished - Jan 2008

Fingerprint

Granuloma
Magnetic Resonance Spectroscopy
Catheters
Magnetic Resonance Imaging
Artifacts
Opiate Alkaloids
Water

Keywords

  • Chronic pain
  • Granuloma
  • Intrathecal catheter tip
  • Intrathecal drug delivery
  • Intrathecal opioids
  • Magnetic resonance imaging
  • Metallic susceptibility artifact

ASJC Scopus subject areas

  • Clinical Neurology
  • Surgery

Cite this

Differentiating intrathecal catheter tip granulomas from normal magnetic resonance image distortion caused by metallic catheter tips. / Magill, Stephen T.; Wang, Paul; Eller, Jorge L.; Burchiel, Kim.

In: Neurosurgery, Vol. 62, No. 1, 01.2008, p. 242-248.

Research output: Contribution to journalArticle

@article{ce98de6b4c7e4e409ff4cecc3add97c5,
title = "Differentiating intrathecal catheter tip granulomas from normal magnetic resonance image distortion caused by metallic catheter tips",
abstract = "OBJECTIVE: To characterize the normal image distortion produced by metallic intrathecal catheter tips and define features that differentiate them from a catheter tip granuloma. METHODS: Three Medtronic Inc. (Minneapolis, MN) intrathecal catheter models (M8709, M8711, and M8731) were placed in a water-filled phantom, which was secured with a spinal coil and scanned with a 1.5-T magnetic resonance imaging (MRI) scanner. MRI scans from two patients receiving intrathecal opiate therapy without a granuloma and one patient with a granuloma were analyzed for comparison. RESULTS: All three catheter models produced a metallic susceptibility artifact, which distorted the local tissue image. The tip appeared as a round, dark void sandwiched between two bright bands in the sagittal plane. Axial views produced an oval-shaped, dark central void completely surrounded by a bright rim. On MRI scans, catheter tip diameter varied from 2.3 to 6.7 mm and tip length varied from 4.0 to 7.5 mm, which is a 74 to 480{\%} increase over their actual size. The catheter tip appearance in the phantom correlated with the tip appearance in MRI scans from patients with intrathecal catheters. Images from a tip granuloma show a bright rim surrounding the catheter tip in the sagittal plane with or without contrast as well as postcontrast enhancement of the whole granuloma, and the catheter tip appeared greater than 5 mm in diameter and length. CONCLUSION: When evaluating possible granuloma development around an intrathecal catheter tip, it is important to take into account the characteristic metallic susceptibility artifact and increased size of normal metallic catheter tips on MRI scans.",
keywords = "Chronic pain, Granuloma, Intrathecal catheter tip, Intrathecal drug delivery, Intrathecal opioids, Magnetic resonance imaging, Metallic susceptibility artifact",
author = "Magill, {Stephen T.} and Paul Wang and Eller, {Jorge L.} and Kim Burchiel",
year = "2008",
month = "1",
doi = "10.1227/01.NEU.0000311083.96389.FB",
language = "English (US)",
volume = "62",
pages = "242--248",
journal = "Neurosurgery",
issn = "0148-396X",
publisher = "Lippincott Williams and Wilkins",
number = "1",

}

TY - JOUR

T1 - Differentiating intrathecal catheter tip granulomas from normal magnetic resonance image distortion caused by metallic catheter tips

AU - Magill, Stephen T.

AU - Wang, Paul

AU - Eller, Jorge L.

AU - Burchiel, Kim

PY - 2008/1

Y1 - 2008/1

N2 - OBJECTIVE: To characterize the normal image distortion produced by metallic intrathecal catheter tips and define features that differentiate them from a catheter tip granuloma. METHODS: Three Medtronic Inc. (Minneapolis, MN) intrathecal catheter models (M8709, M8711, and M8731) were placed in a water-filled phantom, which was secured with a spinal coil and scanned with a 1.5-T magnetic resonance imaging (MRI) scanner. MRI scans from two patients receiving intrathecal opiate therapy without a granuloma and one patient with a granuloma were analyzed for comparison. RESULTS: All three catheter models produced a metallic susceptibility artifact, which distorted the local tissue image. The tip appeared as a round, dark void sandwiched between two bright bands in the sagittal plane. Axial views produced an oval-shaped, dark central void completely surrounded by a bright rim. On MRI scans, catheter tip diameter varied from 2.3 to 6.7 mm and tip length varied from 4.0 to 7.5 mm, which is a 74 to 480% increase over their actual size. The catheter tip appearance in the phantom correlated with the tip appearance in MRI scans from patients with intrathecal catheters. Images from a tip granuloma show a bright rim surrounding the catheter tip in the sagittal plane with or without contrast as well as postcontrast enhancement of the whole granuloma, and the catheter tip appeared greater than 5 mm in diameter and length. CONCLUSION: When evaluating possible granuloma development around an intrathecal catheter tip, it is important to take into account the characteristic metallic susceptibility artifact and increased size of normal metallic catheter tips on MRI scans.

AB - OBJECTIVE: To characterize the normal image distortion produced by metallic intrathecal catheter tips and define features that differentiate them from a catheter tip granuloma. METHODS: Three Medtronic Inc. (Minneapolis, MN) intrathecal catheter models (M8709, M8711, and M8731) were placed in a water-filled phantom, which was secured with a spinal coil and scanned with a 1.5-T magnetic resonance imaging (MRI) scanner. MRI scans from two patients receiving intrathecal opiate therapy without a granuloma and one patient with a granuloma were analyzed for comparison. RESULTS: All three catheter models produced a metallic susceptibility artifact, which distorted the local tissue image. The tip appeared as a round, dark void sandwiched between two bright bands in the sagittal plane. Axial views produced an oval-shaped, dark central void completely surrounded by a bright rim. On MRI scans, catheter tip diameter varied from 2.3 to 6.7 mm and tip length varied from 4.0 to 7.5 mm, which is a 74 to 480% increase over their actual size. The catheter tip appearance in the phantom correlated with the tip appearance in MRI scans from patients with intrathecal catheters. Images from a tip granuloma show a bright rim surrounding the catheter tip in the sagittal plane with or without contrast as well as postcontrast enhancement of the whole granuloma, and the catheter tip appeared greater than 5 mm in diameter and length. CONCLUSION: When evaluating possible granuloma development around an intrathecal catheter tip, it is important to take into account the characteristic metallic susceptibility artifact and increased size of normal metallic catheter tips on MRI scans.

KW - Chronic pain

KW - Granuloma

KW - Intrathecal catheter tip

KW - Intrathecal drug delivery

KW - Intrathecal opioids

KW - Magnetic resonance imaging

KW - Metallic susceptibility artifact

UR - http://www.scopus.com/inward/record.url?scp=41749115532&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41749115532&partnerID=8YFLogxK

U2 - 10.1227/01.NEU.0000311083.96389.FB

DO - 10.1227/01.NEU.0000311083.96389.FB

M3 - Article

C2 - 18300913

AN - SCOPUS:41749115532

VL - 62

SP - 242

EP - 248

JO - Neurosurgery

JF - Neurosurgery

SN - 0148-396X

IS - 1

ER -