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From Wikipedia, the free encyclopedia. A bronchopleural fistula (BPF) is a fistula between the pleural space and the lung. It can develop following pneumonectomy, post traumatically, or with certain types of infection. It may also develop when large airways are in communication with the pleural space following a large pneumothorax or other loss of pleural negative pressure, especially during positive pressure mechanical ventilation. On imaging, the diagnosis is suspected indirectly on radiograph.
An anal fistula is a small tunnel that develops between the end of the bowel and the skin near the anus (where poo leaves the body). They're usually the result of an infection near the anus causing a collection of pus (abscess) in the nearby tissue. When the pus drains away, it can leave a small channel behind. Anal fistulascan cause unpleasant symptoms, such as discomfort and skin irritation, and won't usually get better on their own.