Hello, You have anal fistula and the fistula tract has been traced with external and internal opening between external and internal anal sphincter. Simple inter-sphincteric fistulas can often be treated by fistulotomy (opening the fistulous tract), curettage, and healing by secondary intention. While the majority of fistulas are cryptoglandular in origin, trauma, Crohn s disease, malignancy, radiation, or unusual infections (tuberculosis, actinomycosis, and chlamydia) may also produce fistulas. A complex, recurrent, or non-healing fistula should raise the suspicion of one of these diagnoses. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Tushar Kanti Biswas, Internal Medicine Specialist