The cut surface shows a smooth, homogeneous glistening to slippery cut surface, showing an appearance similar to brain. Sometimes, it is quite firm, especially when there is a large amount of associated fibrosis. The lesions are usually <2 cm in greatest dimension. A high power hematoxylin and eosin stained slide showing the delicate neural tissue within dense fibrosis. The overlying skin or squamous mucosa is intact and uninvolved by the process. There is normal<unk>  tissue set within a fibrous connective tissue stroma. There is such blending, that the underlying process may be difficult to detect without special studies. In a few cases, large gemistocytes, neurons, choroid plexus, ependyma, and retinal pigmented cells may be seen. Histochemistry A split field high power photograph of a trichrome stain (left) and a<unk>  fibrillary acidic protein stain (right) of a<unk> . A trichrome stain will highlight the dual components well, with the<unk>  tissue staining red, while the background fibrosis stains a bright blue. Immunohistochemistry The<unk>  tissue is highlighted with S100 protein and with<unk>  fibrillary acidic protein, although the latter is much more sensitive for<unk>  tissue.
Nasal glial heterotopia
Basilar invagination
Gray matter heterotopia
Dysembryoplastic neuroepithelial tumour
Cranio-lenticulo-sutural dysplasia
Germinal matrix hemorrhage
Cystic hygroma
Choroid plexus papilloma