Patterns in naevoid skin disease: development, disease and modelling

A Rare Entity of Giant Epidermal Exophytic Naevus of Hemifacial Region

The term nevi constitute a hamartomatous growth of either skin or mucosa that is generally found at birth or shortly after birth. An epidermal nevus consisting chiefly of sebaceous glands is called as nevus sebaceous. Typically this entity is seen as a solitary bald patch over the scalp at birth. We report a case of exophytic lesion following blaschko's lines at birth. We find this case as peculiar because of the multiplicity of lesions, their pattern of distribution, as well as their atypical morphology.

Blaschko line analogies in the central nervous system: a hypothesis

In X-chromosome-linked skin disorders the pattern of involvement follows Blaschko lines. Patterns of changes analogous to cutaneous Blaschko lines in different X-linked diseases existed in other organs. There is no commonly accepted analogy to Blaschko lines in the central nervous system (CNS). The objective of this study was to consider a hypothesis of the existence of Blaschko lines in the CNS in the example of incontinentia pigmenti (IP). Articles were analyzed in which brain imaging methods were used in IP patients with CNS anomalies. In IP patients with neurological signs brain lesions usually were localized and extended radially. Affected areas did not correspond to territories vascularized by any determined artery. Radially distributed brain lesions morphologically match the radial unit model of cortical development. It can be proposed that in IP in CNS Blaschko line analogies, similar to those in the skin, represent the trace of development of the clone of neurons arising from the cell marked with IKBKG mutation. The hypothesis of the existence of Blaschko line analogies in CNS is supported by radially distributed CNS image findings in IP, the radial unit model of CNS development, and the common embryonic origin of skin, CNS, and eyes.