Meningocele

Meningocele, a protrusion of a part of the cranial contents through an aperture in the skull, such aperture resulting from defective development of the cranial bones. If the tumour contain brain substance, it is called an encephalocele (q.v.); when the membranes covering the brain alone protrude, it is said to be a meningocele. The most common situations for such protrusions are the occipital region in the middle line of the skull and the root of the nose.