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Figure 3: Magnetic resonance imaging, magnetic resonance angiography and magnetic resonance venography (Brain) of case 3, with hemicrania continua, showing semilunar hyperintensity ("mini-boomerang") on axial T2-weighted (a) and fluid attenuated inversion recovery (b) images with a focal hyperintensity on sagittal T2-weighted image (c); there was no evidence of restriction on diffusion-weighted image (d) and the apparant diffusion coefficient map (e) was normal. Lack of proper visualization of veins at the level of vein of Galen was evident on magnetic resonance venogram (f). Repeat T2-weighted image (g) and fluid attenuated inversion recovery image (h) at 3 months showing complete resolution of the abnormal signals in splenium. Magnetic resonance angiogram (i) did not reveal any abnormality

Figure 3: Magnetic resonance imaging, magnetic resonance angiography and magnetic resonance venography (Brain) of case 3, with hemicrania continua, showing semilunar hyperintensity (