A closed sac or pouch filled with fluid, air, or other material, typically occurring in body tissues as a result of disease, blockage, or developmental abnormality. Most cysts are benign.
From Greek 'kystis' meaning bladder or pouch, through Latin 'cystis'. The medical term entered English in the 18th century as anatomical and medical knowledge expanded, maintaining its original Greek meaning of a bag-like structure.
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