[Magnetic resonance imaging in the evaluation of malignant melanoma of the choroid and ciliary body].
We evaluated 16 patients with malignant melanomas of the choroid (11) or the ciliary body (5) by magnetic resonance imaging (MRI), using a 0.5 T magnet and a surface coil. The tumor was seen in all cases, hyperintense in T1-weighted images, and hypointense in T2-weighted sequences (80%). These images reflected the short T1 and T2 relaxation times caused by the presence of melanin in those tumors. This non-invasive method was superior to computed tomography (70%), and sometimes superior to fundoscopy (2 cases), angiofluorography (3 cases) or echography (1 case). MRI also proved valuable for differentiating uveal melanoma from associated subretinal effusion.
Bossard
D
D
Service de neuroradiologie et de radiologie ostéoarticulaire, Hop., E. Herriot, Lyon.
Grange
J D
JD
Froment
J C
JC
Gerard
J P
JP
Lyonnet
D
D
D000328:Adult; D000368:Aged; D002830:Choroid Neoplasms / Q000175:diagnosis*; D002924:Ciliary Body; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008545:Melanoma / Q000175:diagnosis*; D008875:Middle Aged; D014604:Uveal Neoplasms / Q000175:diagnosis*
Apport de l'imagerie par résonance magnétique dans l'évaluation des mélanomes malins de la choroïde et du corps ciliaire.