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Cyst (cont.)

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What causes a cyst?

There are many causes of cyst formation. The following are some of the major causes of cyst formation:

  • Genetic conditions
  • Tumors
  • Infections
  • Errors in embryonic development
  • Cellular defects
  • Chronic inflammatory conditions
  • Blockages of ducts in the body
  • Parasites
  • Injuries

There are hundreds of different types of cysts. Cysts can occur almost anywhere in the body. The majority of cysts are benign, but a few may contain malignant cells. The following cyst types may be found in the body:

  • Epidermoid (sebaceous) cyst: usually benign swelling in the skin arising in the sebaceous gland, typically filled with yellowish sebum
  • Breast cyst: a fluid-filled sac within the breast
  • Ganglion or synovial cyst: a non-neoplastic soft-tissue collection that may occur in any joint
  • Dermoid cyst: an abnormal growth containing epidermis, hair follicles, and sebaceous glands, derived from residual embryonic cells
  • Ovarian cyst: an accumulation of fluid within an ovary that is surrounded by a very thin wall
  • Baker cyst: a benign swelling of the membranous synovial bursa behind in the knee; also known as a popliteal cyst
  • Bartholin cyst: formed when a Bartholin gland (at the opening of the vagina) is blocked
  • Arachnoid cyst: a collection of cerebrospinal fluid covered by arachnoid cells and collagen that develops between the surface of the brain in the cranial base or on the arachnoid membrane
  • Epididymal cyst: extratesticular spherical cysts in the head of the epididymis
  • Labial cyst: any fluid-filled cyst in the labia
  • Pilonidal cyst: a cyst that contains hair and skin debris near or on the cleft of the buttocks; also known as jeep driver's disease
  • Nabothian cyst: a mucous-filled cyst on the surface of the cervix
  • Pineal cyst: a fluid-filled body in the pineal gland (of the brain)
  • Thyroglossal cyst: a fibrous cyst that forms from a persistent thyroglossal duct
  • Synovial cyst: also known as a ganglion cyst, is a soft tissue lump that may occur in any joint
  • Branchial cleft cyst: a cyst composed of epithelial cells that arise on the lateral part of the neck due to congenital failure of obliteration of the second branchial cleft
  • Choroid plexus cyst: small cysts composed of cerebrospinal fluid trapped by spongy brain cells
  • Hydatid cyst: Echinococcus spp. tapeworm (larval stage) surrounded by epithelial cells in an organ
  • Corpus luteum cyst: a type of ovarian cyst that may persist after an egg has been released from a follicle
  • Colloid cyst: in the brain, a cyst containing gelatinous material
  • Mucous cyst: a thin sac containing clear fluid that may be found on the lips, mouth, and occasionally in other areas of the body
  • Pancreatic cyst: sac-like pockets of fluid within the pancreas; technically, they aren't cysts because they are lined with scar or inflammatory tissue
  • Testicular cysts: fluid-filled cysts in the testicles
  • Thyroid cysts: Also called a thyroid nodules, they may be fluid filled or contain some solid components; most are benign but a few may contain malignant components.
  • Liver cysts: thin-walled cysts that contain fluid; the majority are benign
  • Kidney cyst: walled-off fluid-filled areas within the kidney; some are congenital (polycystic disease)
  • Sinus cysts: abnormal tissue growth, usually in the maxillary sinuses, filled with liquid, air, or semisolid material
  • Acne cyst: aggregations of inflamed and clogged skin oil ducts; many are not cysts but are abscesses

Readers should note that many cysts types are not listed; the purpose of this article is to give the reader an introduction to the hundreds of types of cysts and is not meant to be all inclusive.

Medically Reviewed by a Doctor on 2/13/2014

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Cyst - Symptoms and Signs Question: The symptoms of cysts can vary greatly from patient to patient. What were your initial symptoms?
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Source: MedicineNet.com
http://www.medicinenet.com/cyst/article.htm

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