The bombé forehead is characteristic of hydrocephaly, but may occur also in the scaphoid cranium.
hydrocephalus hy·dro·ceph·a·lus (hī'drō-sěf'ə-ləs) or hy·dro·ceph·a·ly (-lē)
n.
A usually congenital condition in which an abnormal accumulation of fluid in the cerebral ventricles causes enlargement of the skull and compression of the brain, destroying much of the neural tissue.