表皮样囊肿又称表皮囊肿,包含囊肿等。临床常见,常被误诊为皮脂腺囊肿。病因:主要由表皮异位发展而成。(1)先天性因素:在胚胎发育中,表皮脱落至其他部位,或表皮基底层细胞残留于某处,继续发育形成囊肿。如表皮异位于颜面突起的闭合线附近,则在眶缘、额角、口底等处形成囊肿;表皮异位于神经管闭合线附近,则在前囱或枕骨粗隆附近头皮下,或中枢神经系统内形成囊肿。因为这些囊肿的胚胎基础是在闭合线附近,在临床上则位于人体中线或中线附 Epidermoid cysts, also known as epidermal cysts, including cysts and so on. Common clinical, often misdiagnosed as sebaceous cyst. Etiology: mainly from the ectopic development of the epidermis. (1) congenital factors: in the embryonic development, the epidermis shedding to other parts, or epidermal basal cells remain somewhere, continue to develop the formation of cysts. If the epidermis is located in the vicinity of the closed line of the facial protrusion, the cyst is formed at the orbital rim, forehead, mouth bottom, etc. The epidermis is located in the vicinity of the closed line of the neural tube, in the vicinity of the scalp or the scalp, Nervous system to form cysts. Because these cysts are based on the embryo in the vicinity of the closed line, in the clinical center of the human body is located in the middle or with