Block veebrae are seen in -

Features of Klippel Feil syndrome: Fused/block veebra. hemiveebra spina bifida occulta scoliosis atlas occipitalization associated with sprengel's deformity Also know Klippel Trenaunay syndrome : * Klippel-Trenaunay syndrome presents with a classic triad of hemi-hyperophy, po wine stain, and congenital venous or venolymphatic malformations. * This entity should be distinguished from Parkes-Weber syndrome, which is similar, but features formation of aeriovenous malformations (leading to high output cardiac failure) and no lymphatic malformations.