platystencephaly

pla·tys·ten·ceph·a·ly

(plă-tis'ten-sef'ă-lē),
Extreme width of the skull in the occipital region, with anterior narrowing and prognathism.
[G. platystos, widest, superl. of platys, wide, + enkephalē, brain]

platystencephaly

(plăt″ĭ-stĕn-sĕf′ă-lē) [″ + kephale, head]
Having a skull wide at the occiput.