MR imaging features of metastatic brain lesions
| Melanoma | Lung | |
|---|---|---|
| Total lesion number | 120 | 120 |
| Susceptibility effect | 42% (50/120) | 8% (10/120) (P < .01) |
| Amelanotic/slightly | 49% (17/35)* | |
| Heavily melanotic | 33% (10/30)† (P = .4) | |
| Hyperintense T1WI | 55% (66/120) | 12% (15/120) (P < .01) |
| Amelanotic/slightly | 49% (17/35) | |
| Heavily melanotic | 83% (25/30) (P < .01) | |
| Enhancement | 78% (94/120) | 98% (118/120) (P = .02) |
| Edema | 68% (82/120) | 66% (80/120) (P = .56) |
* Total of 35 lesions in 20 patients with biopsy material.
† Total of 30 lesions in 20 patients with biopsy material.