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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.
Not all middle ear epidermal cysts are congenital, as they can be acquired either by metaplasia of the middle ear mucosa or by traumatic implantation of ear canal or tympanic membrane skin. In addition, cholesteatoma inadvertently left by a surgeon usually regrows as an epidermal cyst. Some authors have also suggested hereditary factors. [9] [10]
Preauricular sinuses and cysts result from developmental defects of the first and second pharyngeal arches. [10] This and other ear malformations are sometimes associated with renal anomalies. [ 11 ] In rare circumstances these pits may be seen in genetic conditions such as branchio-oto-renal syndrome ; however these conditions are always ...
Steatocystoma multiplex (epidermal polycystic disease, sebocystomatosis) Steatocystoma simplex (simple sebaceous duct cyst, solitary steatocystoma) Stucco keratosis (digitate seborrheic keratosis, hyperkeratotic seborrheic keratosis, keratosis alba, serrated seborrheic keratosis, verrucous seborrheic keratosis)
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.
Pseudocyst of the auricle, also known as auricular pseudocyst, endochondral pseudocyst, cystic chondromalacia, intracartilaginous auricular seroma cyst, and benign idiopathic cystic chondromalacia, [1] is a cutaneous condition characterized by a fluctuant, tense, noninflammatory swelling on the upper half of the ear, known as the auricle or pinna.
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 ...