Fig. 5
From: A rare case of diploic venous anomaly: asymptomatic venous sac expanding in the diploe
Histological images of a membranous wall of varix-like venous sac. The upper image was in a low power field (a Hematoxylin and eosin staining, ×150), and the lower images were in high power fields (b Hematoxylin and eosin staining; c CD31 staining; d silver staining, ×400). The membrane mainly consisted of a thick layer of fibrous tissues. Osseous tissues (asterisk) were attached to the upper side of the membrane (a). The other side was lined by a single layer of endothelial cells (b), which showed positive CD31 staining (c). Silver staining of the membrane was negative, indicating the absence of elastic laminae (d)