A congenital condition presenting at birth as a localized absence of skin, most commonly a solitary, well-demarcated, membranous or ulcerative lesion on the scalp vertex.
A congenital protrusion of the brain and/or meninges through a skull defect, presenting as a soft, pulsatile, skin-covered mass.
A congenital cyst, often found in the midline, that is firm, non-tender, and may be fixed to the underlying periosteum.
A firm, dome-shaped subcutaneous nodule containing keratin, which is much less common than a dermoid cyst in the midline scalp of a child.
A rare anomaly where brain tissue is found outside the skull, presenting as a hairless, skin-colored nodule, also known as a 'nasal glioma' when near the nose.
