Desmoid tumor MRI: Difference between revisions

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*MRI is preferred over CT, especially for truncal and extremity tumors
*MRI is preferred over CT, especially for truncal and extremity tumors
*MRI characteristics of desmoid tumors are variable depending on their cellularity and fibrous content:
*MRI characteristics of desmoid tumors are variable depending on their cellularity and fibrous content:
*Desmoids may be hypointense or isointense to muscle on T1-weighted images; they are predominantly hyperintense on T2-weighted images, but hypointense bands may be seen that represent dense collections of collagen bundles [73]. T2 hyperintensity may diminish over time as tumor cellularity decreases and collagen deposition increases [74]. With the administration of gadolinium, desmoids typically show moderate to marked enhancement, and the hypointense bands may become more apparent because collagen bundles are not enhanced by contrast material [75]. Its appearance is characterized by their dense cellularity. Typical signal characteristics include:<ref name="radio">Desmoid tumor. Radiopedia(2015) http://radiopaedia.org/articles/aggressive-fibromatosis. Accessed on January 20, 2015</ref>
**T1-weighted images:
****Desmoids may be hypointense or isointense to muscle
**T2-weighted images:
***Predominantly hyperintense (T2 hyperintensity may diminish over time as tumor cellularity decreases and collagen deposition increases)
***Hypointense bands may be seen that represent dense collections of collagen bundles
***With gadolinium administration
****Desmoids typically show moderate to marked enhancement
****Hypointense bands may become more apparent because collagen bundles are not enhanced by contrast material<ref name="radio">Desmoid tumor. Radiopedia(2015) http://radiopaedia.org/articles/aggressive-fibromatosis. Accessed on January 20, 2015</ref>
<gallery>MRI_desmoid_T1_fl2d_FS.jpg | MRI of desmoid tumor<ref name=aa>Desmoid Tumor mri. https://en.wikipedia.org/wiki/Aggressive_fibromatosis#/media/File:MRI_desmoid_T1_fl2d_FS.jpg</ref></gallery>
<gallery>MRI_desmoid_T1_fl2d_FS.jpg | MRI of desmoid tumor<ref name=aa>Desmoid Tumor mri. https://en.wikipedia.org/wiki/Aggressive_fibromatosis#/media/File:MRI_desmoid_T1_fl2d_FS.jpg</ref></gallery>


Revision as of 18:46, 1 March 2019

Desmoid tumor Microchapters

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Case #1

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Sara Mohsin, M.D.[2]Faizan Sheraz, M.D. [3]

Overview

Abdominal MRI may be diagnostic of desmoid tumor. On MRI, desmoid tumor is characterized by dense cellularity and loss of signal following fat saturation.[1]

MRI

  • MRI is required in order to:
    • Define the relationship of the tumor to adjacent structures
    • Assess resectability
    • Find out the need for treatment
  • MRI is preferred over CT, especially for truncal and extremity tumors
  • MRI characteristics of desmoid tumors are variable depending on their cellularity and fibrous content:
    • T1-weighted images:
        • Desmoids may be hypointense or isointense to muscle
    • T2-weighted images:
      • Predominantly hyperintense (T2 hyperintensity may diminish over time as tumor cellularity decreases and collagen deposition increases)
      • Hypointense bands may be seen that represent dense collections of collagen bundles
      • With gadolinium administration
        • Desmoids typically show moderate to marked enhancement
        • Hypointense bands may become more apparent because collagen bundles are not enhanced by contrast material[1]
  • MRI of desmoid tumor[2]

    MRI of desmoid tumor[2]

Reference

  1. ↑ 1.0 1.1 Desmoid tumor. Radiopedia(2015) http://radiopaedia.org/articles/aggressive-fibromatosis. Accessed on January 20, 2015
  2. ↑ Desmoid Tumor mri. https://en.wikipedia.org/wiki/Aggressive_fibromatosis#/media/File:MRI_desmoid_T1_fl2d_FS.jpg

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