Individual manual segmentations (a,c): original segmentations, (b,d): segmentations with 4 missing structures. Legend: red, blue, green: cortical, sub-cortical and cerebellar grey matter, yellow: white matter, pink: CSF, cyan: cerebellar white matter and brainstem. (e): reference label fusion (all structures used), (f): label fusion without accounting for missing structures, (g): label fusion utilizing prior information with a MAP STAPLE formulation.