<unk>  is a condition characterized by an asymmetrical distortion (flattening of one side) of the skull.<unk>  is the word that is used to describe a diagonal asymmetry across the head shape. This word particularly describes a flattening which is to one side at the back of the head and there is often some facial asymmetry. Brachycephaly describes a very wide head shape with a flattening across the whole back of the head.
Plagiocephaly
Deformational plagiocephaly
Macrocephaly
Microcephaly
Acephaly 
Schizencephaly
Megalencephaly
Hydranencephaly