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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 an abnormal connection between the anal. canal and the skin near the anus. It has an entrance in the. anal canal (internal opening) and an exit on the skin near. the anus (external opening). The fistula itself is a tunnel or. tube connecting the internal and external openings which. crosses the anal sphincter muscles. Most anal fistulas. follow an anal abscess.