A rare genetic dermis disorder with characteristics of slowly progressive thickening of the scalp, which becomes raised and forms ridges and furrows with symmetrical distribution resembling the cerebral gyri and cannot be flattened by traction or pressure, associated with ophthalmologic (for example congenital cataract) and/or neurological abnormalities (for example intellectual disability, epilepsy, microcephaly, encephalopathy). [from
SNOMEDCT_US]