Lacunar skull is an anomaly of the skull of the new-born usually associated with spina bifida and meningocele and occasionally with encephalocele. It is characterized by defects on the inner vault in the form of shallow depressions or deep cavitations extending to the outer surface, which vary in size, shape and number. When such a skull is examined, the thinned areas appear translucent, lined by dura and bordered by thick interlacing ridges of bone. These ridges are actually no thicker than the normal bone, but they appear so because of the intervening zones of rarefaction. Commonly present in the frontal and the parietal portion of the skull, they may also be seen in the occipital region.
West,1 an Englishman, reported in 1875 a case of cervical spina bifida and meningocele associated with defects of the skull in a new-born child. The head, of normal size at birth, soon enlarged