Fig. 1From: Primary diffuse meningeal melanomatosis – a rare form of meningeal melanoma: case reportCervical spinal cord MRI T1-weighted imaging without (a) and with (b) gadolinium contrast enhancement. Hyper-intensity on T1 was due to the paramagnetic effect of melanin, which had stable organic free radicals inside it, resulting in shortened T1 relaxation times in typical melanotic melanomaBack to article page