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Related Experiment Videos

Ampullary carcinoma: demonstration by current MR techniques

R C Semelka1, N L Kelekis, G John

  • 1Department of Radiology, University of North Carolina Chapel Hill 27599-7510, USA.

Journal of Magnetic Resonance Imaging : JMRI
|January 1, 1997
PubMed
Summary

Magnetic resonance imaging (MRI) effectively visualizes ampullary carcinoma. Advanced MRI techniques, including fat suppression and gadolinium enhancement, clearly define tumor characteristics and location.

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Area of Science:

  • Radiology
  • Oncology
  • Gastroenterology

Background:

  • Ampullary carcinoma is a rare malignancy.
  • Early detection is crucial for effective treatment.
  • Standard diagnostic methods may have limitations.

Purpose of the Study:

  • To demonstrate the imaging appearance of ampullary carcinoma using current magnetic resonance imaging (MRI) techniques.
  • To evaluate the utility of fat suppression, gadolinium enhancement, and MR cholangiography in visualizing these tumors.

Main Methods:

  • Nine patients with histologically confirmed ampullary carcinoma underwent MRI at 1.5 T.
  • Standard MRI sequences included T1-weighted spoiled gradient echo, T1-weighted fat-suppressed, and immediate postgadolinium spoiled gradient echo.
  • MR cholangiography was performed in three patients.

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Main Results:

  • Ampullary carcinomas ranged from 1.5 to 5.5 cm.
  • Tumors appeared as low-signal-intensity masses on precontrast T1-weighted and fat-suppressed images.
  • Tumors showed less enhancement than normal pancreatic tissue post-gadolinium.
  • Tumor conspicuity was highest on immediate postgadolinium images.
  • MR cholangiography revealed biliary obstruction and pancreatic duct dilatation.

Conclusions:

  • MRI can effectively demonstrate ampullary carcinomas.
  • Post-gadolinium enhanced images provide the best tumor definition.
  • MR cholangiography aids in assessing ductal obstruction.