Fig. 4

Microscopic appearance of a resected unilateral naso-ethmoidal meningoencephalocele (a, scale bar  =  1000 µm) with left (b, scale bar  =  50 µm) and right (c, scale bar  =  50 µm) box magnified. Subgrossly the section is mildly fragmented and exhibits multifocal areas of haemorrhage. The neuropil is caudally lined by a thick layer of fibrous and mildly mineralized connective tissue (b). The neuropil is lined by respiratory epithelium that is multifocally loss and replaced by haemorrhage and necrotic debris (c)