Table 2.
Differential diagnosis (1st column) and MR imaging appearance (columns 2–6) for a duplicated massa intermedia.
| T1W MR | T2W MR | T1W post con | DWI MR | Location | |
|---|---|---|---|---|---|
| Duplicated MI | Isointense | Isointense | Isointense | Isointense | Connecting thalami |
| Hamartoma | Isointense | Isointense | Isointense | Isointense | Thalamus |
| Glioma | Hypointense | Hyperintense | Variable +/− enhancement | Variable | Thalami |
| Heterotopia | Isointense | Isointense | Isointense | Isointense | Sub-ependymal |
| Giant cell tumor | Variable | Variable | Hyperintense + enhancement | Variable | Foramen of Monroe |
| Intraventricular neoplasm | Variable Hypointense | Variable Hyperintense | Hyperintense + enhancement | Variable | Ventricle |
Displayed intensity is relative to the normal thalamic signal intensity. MI = massa intermedia, W = weighted, con = contrast, DWI = diffusion weighted images.