Table 2 Imaging features of orbital melanoma on T1/T2MRI sequences
Morphology | T1 | T2 | DWI | CE-MRI |
|---|---|---|---|---|
Mass shadow | Isosignal | Isosignal | N/A | N/A |
Mass shadow | Isosignal | slightly high signal | High signal intensity | Mild heterogeneous enhancement |
Nodular mass | Short | Short | N/A | Enhancement |
Nodular mass | Heterogeneous Isointense Short | Heterogeneous Isointense Short | N/A | Mild heterogeneous enhancement |
Mass shadow | slightly prolonged | Isointense | Low signal intensity | Mild to moderate enhancement |
Mass shadow | Short | Long | N/A | Heterogeneous enhancement |
Mass shadow | Isosignal | Isosignal | N/A | Heterogeneous enhancement |
Irregular mass | Heterogeneous | Heterogeneous | N/A | Heterogeneous enhancement |
Strip | N/A | Isosignal | N/A | No enhancement |
Mass shadow | Heterogeneous | Heterogeneous | High signal intensity | N/A |
Semi-elliptical | Slightly shortened | Isosignal | Iso-signal intensity | Homogeneous moderate enhancement |
Nodular | Isosignal | Iso-long | Heterogeneous high signal intensity | Heterogeneous enhancement |
Ellipsoid | Short | Short | N/A | Mild to moderate enhancement |
Broad-based polypoid | Short | Short | N/A | Enhancement |