fistula, fistula of parotid gland, fistula of salivary duct, fistula sacci lacrimalis, fistula cervicovaginalis, fistula of abdominal wal, fistula of thoracic duct, fistula of mammary glands, fistula of abdominal wall, fistula of lacrimal gland, fistula of dorsum of nose 返回 fistulation