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abscess
A localized accumulation of pus in a cavity caused by tissue breakdown as a result of infection or foreign materials. It is a tissue defence reaction to prevent the spread of infection to other parts ...

fistula
An abnormal connection between two compartments or territories that are lined by epithelium, e.g. between anus and skin (anal fistula) or between rectum and vagina (obstetric fistula).
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