Orbital dermoid cyst

Dermoid cyst and epidermoid cyst are both congenital cysts. The two types of cysts are slightly different in pathological structure, but they are basically a disease in clinical, tissue origin, clinical manifestations, and diagnosis. And treatment is basically the same. It may be that the remnants of the surface epithelium during the embryonic period are trapped in the bone gap, and the lesions continuously fall off to form cysts. The cyst is filled with thin keratinized squamous epithelium lining and typical exfoliated keratin under the microscope. The cyst wall has no attachment structure. The cyst contains a large amount of cholesterol, also known as cholesteatoma; It is surrounded by fibrous connective tissue. In addition to scaly epithelium, dermal cysts have dermis, varying amounts of subcutaneous tissue, and skin attachments, such as hair follicles, sebaceous glands, and sweat glands. A few cysts are completely filled with liquid fat, and they are called true epidermoid tumors or oil cysts.