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Implantation cyst
A cyst resulting from displacement of portions of the epidermis, as may occur in injuries.
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Exudation cyst
A cyst caused by trapping of an exudate in a closed area. A cyst is a lump or swelling filled with fluid that develops when an existing body cavity becomes filled with exudate. An example of an exudation cyst is a hydrocele, which is a fluid-filled swelling occurring in the scrotum.
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Extravasation cyst
A cyst arising from hemorrhage or escape of other body fluids into tissues.
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Epidermoid cyst
A cyst filled with keratin, sebum, and skin debris that may form on the scalp, the back of the neck, or the axilla. It is benign but can be removed surgically. An innocuous nodule located beneath the skin’s surface, containing yellow, cheesy material. The terms “epidermoid cyst” and “sebaceous cyst” are frequently used interchangeably to…
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Endometrial cyst
An ovarian cyst or tumor lined with endometrial tissue, usually seen in ovarian endometriosis.
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Distention cyst
A cyst formed in a natural enclosed cavity, such as a follicular cyst of the ovary.
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Dentigerous cyst
A fluid-filled cyst usually surrounding the crown of an unerupted tooth; often involves incomplete enamel formation. A fluid-filled cyst, manifested as a lump or swelling, can develop around the crown of a tooth that fails to erupt. This particular type of cyst has the potential to cause swelling or resorption (loss of tissue) of the…
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Daughter cyst
A cyst growing out of the walls of another cyst.
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Congenital cyst
A cyst present at birth resulting from abnormal development, such as a dermoid cyst, imperfect closure of a structure as in spina bifida cystica, or non-closure of embryonic clefts, ducts, or tubules, such as cervical cysts.
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Complex cyst
A cyst that consists of solid material and fluid-filled cavities; it may have walls of tissue inside it or internal echoes. When a complex cyst is identified on ultrasound, surgical removal is generally indicated to exclude malignancy.
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