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Figure 1: (a) MRI T1W axial section shows a hypointense cystic lesion with an isointense solid area in the brainstem. (b–d) MRI T2W sequences show a large unilocular cystic lesion with few solid nodular areas superiorly and inferiorly. (e) MRI diffusion-weighted image shows no diffusion restriction. (f–h) MRI contrast sequences show a thin peripheral rim of enhancement along with heterogeneous enhancement in its solid components. (i) MRI susceptibility weighted image shows blooming along the periphery of the lesion. (j and k) MRI Constructive Interference in Steady State (CISS) 3D image shows the cystic part of the lesion being relatively less hyperintense as compared to the CSF. (l) MRA shows markedly attenuated caliber of the bilateral vertebral arteries (right more attenuated than the left) and the basilar artery (orange arrow). CSF = cerebrospinal fluid, MRA = magnetic resonance angiography, MRI = magnetic resonance imaging, T1W = T1 weighted, T2W = T2 weighted

Figure 1: (a) MRI T1W axial section shows a hypointense cystic lesion with an isointense solid area in the brainstem. (b–d) MRI T2W sequences show a large unilocular cystic lesion with few solid nodular areas superiorly and inferiorly. (e) MRI diffusion-weighted image shows no diffusion restriction. (f–h) MRI contrast sequences show a thin peripheral rim of enhancement along with heterogeneous enhancement in its solid components. (i) MRI susceptibility weighted image shows blooming along the periphery of the lesion. (j and k) MRI Constructive Interference in Steady State (CISS) 3D image shows the cystic part of the lesion being relatively less hyperintense as compared to the CSF. (l) MRA shows markedly attenuated caliber of the bilateral vertebral arteries (right more attenuated than the left) and the basilar artery (orange arrow). CSF = cerebrospinal fluid, MRA = magnetic resonance angiography, MRI = magnetic resonance imaging, T1W = T1 weighted, T2W = T2 weighted