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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.
A sebaceous cyst is a term commonly used to refer to either: [1] Epidermoid cysts (also termed epidermal cysts, infundibular cyst) Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts) Both of the above types of cysts contain keratin, not sebum, and neither originates from sebaceous glands.
Vocal fold cysts (also known as vocal cord cysts) are benign masses of the membranous vocal folds. [1] These cysts are enclosed, sac-like structures that are typically of a yellow or white colour. [2] They occur unilaterally on the midpoint of the medial edge of the vocal folds. [1] They can also form on the upper/superior, surface of the vocal ...
By 2010, studies supported that epidermoid cysts are believed to be caused by dystrophic calcification. This process involves subclinical inflammation, rupture, calcification, and cyst wall obliteration. [6]
The cysts can be removed via excision, though conventional cyst excision techniques have proven impractical, and a specialized regimen is required. [5] Cryotherapy and electrodessication may also be tried, but since it is a genetic disorder all the modalities have very little effect. Individual cysts can be removed surgically.
Pilomatricoma is a benign skin tumor derived from the hair matrix. [2] [3] These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities.
Sebaceous cyst is a term used to refer to both an epidermoid cyst and a pilar cyst, though neither of these contain sebum, only keratin and do not originate in the sebaceous gland and so are not true sebaceous cysts. A true sebaceous cyst is relatively rare and is known as a steatocystoma. [38]
Proliferating epidermoid cysts are a cutaneous condition characterized by tumors that have deep invasion, and are associated with anaplasia and a high mitotic rate. [ 2 ] : 677 [ 1 ] See also