I had one recently removed from my neck . Dr said it was the size of a baseball?
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a closed, bladderlike sac formed in animal tissues, containing fluid or semifluid matter
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A cyst is an abnormal, closed sac-like structure within a tissue that contains a liquid, gaseous, or semisolid substance. A cyst can occur anywhere in the body and can vary in size. The outer, or capsular, portion of a cyst is termed the cyst wall.