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A dermoid cyst is a teratoma of a cystic nature that contains an array of developmentally mature, solid tissues. It frequently consists of skin, hair follicles, and sweat glands, while other commonly found components include clumps of long hair, pockets of sebum, blood, fat, bone, nail, teeth, eyes, cartilage, and thyroid tissue.
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A pilonidal cyst can resemble a dermoid cyst, a kind of teratoma (germ cell tumor). In particular, a pilonidal cyst in the gluteal cleft can resemble a sacrococcygeal teratoma . Correct diagnosis is important because all teratomas require consultation with an oncologist and complete surgical excision, if possible without any spillage.
Congenital dermal sinus is an uncommon form of cranial or spinal dysraphism. [2] [3] It occurs in 1 in 2500 live births. [3]It occurs as a dermal indentation, found along the midline of the neuraxis and often presents alongside infection and neurological deficit. [2]
Ectodermal dysplasia (ED) is a group of genetic syndromes all deriving from abnormalities of the ectodermal structures. [1]: 570 More than 150 different syndromes have been identified.
Relative incidence of cutaneous cysts, where epidermoid cysts constitute a plurality (blue area). An epidermoid cyst or epidermal inclusion cyst [1] is a benign cyst usually found on the skin. The cyst develops out of ectodermal tissue. Histologically, it is made of a thin layer of squamous epithelium.
Large numbers of lobules coalescing into a definitely elevated mass may be called benign sebaceous hyperplasia, and occasional small keratin-filled pseudocysts may be seen and must be differentiated from epidermoid cyst or dermoid cyst with sebaceous adnexa.
A thyroglossal cyst or thyroglossal duct cyst is a fibrous cyst that forms from a persistent thyroglossal duct. Thyroglossal cysts can be defined as an irregular neck mass or a lump which develops from cells and tissues left over after the formation of the thyroid gland during developmental stages.