A dermoid cyst appeared in the floor of a the mouth of a 47-year-old woman (Figs. 1, 2). Incision of the resected specimen (Fig. 3) revealed that it contained many small globular inclusions (Fig. 4). The cyst wall had a lining of stratified squamous epithelium and sebaceous glands (Fig. 5) and foreign body giant cells (Fig. 6). Therefore, it was diagnosed histopathologically as dermoid cyst. Histochemical and biochemical analyses about the globular inclusions (Figs. 4, 7) showed that they consisted mainly of lipids especially cholesterol (Fig. 10; Table 1) and partly of proteins excepting collagen fibers (Fig. 9; Table 2) and polysaccharides (Fig. 8)
