Definition A cyst is a closed pocket or pouch of tissue. It can be filled with air, fluid, pus, or other material. Considerations Cysts may form within any tissue in the body. Cysts within the lung generally are air-filled, while cysts involving the lymph system or kidneys are fluid-filled. Certain parasites, such as trichinosis , dog tapeworm ( Toxocara canis ), and echinococcus , can form cysts within the muscles, liver, brain, lungs, and eyes. Cysts are common on the skin. They develop as a result of infection, clogging of sebaceous glands (acne-related cysts), or around a foreign object stuck in the skin. See also: Pilonidal dimple Common Causes
A Colloid Cyst is a collection of gelatinous material in the brain. Colloid cysts arise within the brain. The cysts are well-encapsulated and consist of a layer of connective tissue covered with cells. The wall encapsulates a thick, gelatinous (colloid-like) material. Symptomatic cysts vary from 6 mm to 9 cm in diameter, but usually range from 1 to 3 cm. They usually take origin from the roof of the third ventricle just posterior to the foramen of Monro within the brain (the third ventricle is the median cavity in the brain bounded by the thalamus and the hypothalamus on either side, and anteriorly by the optic chiasm). A colloid cyst in the third ventricle of the brain can lead to hydrocephalus . Hydrocephalus is the increased accumulation of cerebrospinal fluid within the ventricles of the brain. The cause of colloid cysts is unknown. Symptoms usually occur in adults and may be dramatic, with episodes of headache , weakness of the limbs, and loss of consciousness. These symptoms are attrib...
What are ovarian cysts? Cysts are fluid filled sacs which can develop anywhere on the body. There are several different types of ovarian cysts:
Functional cyst - These form during the normal menstrual cycle. A sac containing eggs forms and usually breaks open to release the egg and the sac dissolves. Sometimes, the sac doesn’t break open and continues to grow, this is called a follicular cyst. It usually disappears in 30 to 90 days. Another type of functional cyst is called corpus luteum and it is when the sac doesn’t dissolve right away. This usually disappears on its own in a few weeks.
Endometriomas - This type of cyst can develop in women who have endometriosis . Tissue from the lining of the uterus grows outside the uterus and if it attaches to the ovary it can cause an cyst.
Cystadenomas - This type of cyst forms from the outer cells of the ovary.
Dermoid cysts - Cells in the ovary which develop hair, teeth or other tissue during pregnancy can become part of an ovari...
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