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| {{CMG}}{{AE}}{{Simrat}} | | {{CMG}}{{AE}}{{Simrat}} |
| ==Overview== | | ==Overview== |
| Head and neck MRI scan is diagnostic of uveal melanoma. On [[head]] and [[neck]] [[MRI]], uveal melanoma is characterized by isointense to hypointense mass on T1-weighted MRI and hyperintense mass on T2-weighted MRI.<ref name="radio"> Retinoblastoma. Radiopedia(2015) http://radiopaedia.org/articles/primary-uveal-malignant-melanoma Accessed on October 21, 2015</ref>
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| ==MRI== | | ==MRI== |
| MRI is the modality of choice for assessment of malignant uveal melanomas.<ref name="radio"> Retinoblastoma. Radiopedia(2015) http://radiopaedia.org/articles/primary-uveal-malignant-melanoma Accessed on October 21, 2015</ref>
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| {| style="border: 0px; font-size: 90%; margin: 3px; width: 600px" align=center
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| |valign=top|
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| ! style="background: #4479BA; width: 200px;" | {{fontcolor|#FFF|MRI component}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|Features}}
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |
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| :T1 or Proton Density
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| | style="padding: 5px 5px; background: #F5F5F5;" |
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| *Uveal melanomas are seen as moderately high signal mass lesion
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| *Associated exudative retinal detachment is moderately high signal
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T2
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| | style="padding: 5px 5px; background: #F5F5F5;" |
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| *Moderately low signal mass lesion
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| *Associated exudative retinal detachment is moderately high signal
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| *Haemorrhagic subretinal fluid has variable signal pattern
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T1 contrast with gadolinium
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| | style="padding: 5px 5px; background: #F5F5F5;" |
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| *Tumors enhance
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| *Fat suppression useful in detecting extraocular extention
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| |-
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| |}
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| <gallery>
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| Axial T1 choroidal melanoma.jpg|Ultrasound showing primary uveal melanoma<ref name="radio1">Image courtesy of Dr. Preveen Jha [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/choroidal-melanoma-1]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref>
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| Coronal T1 choroidal melanoma.jpg|Ultrasound showing primary uveal melanoma<ref name="radio1">Image courtesy of Dr. Preveen Jha [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/choroidal-melanoma-1]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref>
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| </gallery>
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| ==References== | | ==References== |
| {{reflist|2}} | | {{reflist|2}} |