Figure 4
From: Multiple dermoid sinuses of type Vb and IIIb on the head of a Saint Bernard dog
Histological characteristics of the wall cyst. A portion of a cyst with keratin and several hair shafts in the lumen. The cyst wall at the bottom of the figures contains numerous radial folliculosebaceous units that open in to the cyst. The dermis over the cyst is fibrotic without hair follicles. On the upper left corner is evident a small portion of the wall of another cyst. Deep dermis and subcutis, dog. Bar = 1000 μm, haematoxylin and eosin stain.