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Table 3: 
MR imaging features of metastatic brain lesions
MelanomaLung
Total lesion number120120
Susceptibility effect42% (50/120)8% (10/120) (P < .01)
    Amelanotic/slightly49% (17/35)*
    Heavily melanotic33% (10/30)† (P = .4)
Hyperintense T1WI55% (66/120)12% (15/120) (P < .01)
    Amelanotic/slightly49% (17/35)
    Heavily melanotic83% (25/30) (P < .01)
Enhancement78% (94/120)98% (118/120) (P = .02)
Edema68% (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.