Aims and Objectives: The aim of our study is to evaluate and classify the various types of peri anal fistula.

Materials and Methods: A Prospective study of 61 patients with suspected fistula in ano, primary or recurrent, referred from the surgery outpatient department was done in the Rajah Muthiah Medical College, Annamalai University, Chidambaram between October 2014 to September 2016 and the results were analyzed.

Results: 1) The mean age of the study patients is 39.74 ± 11.92 years. 2) Grade IV fistula is common (26.2%) followed by Grade III (21.3%) and Grade II (21.3%) fistulas.

Conclusion: Peri anal fistula is more commonly seen in men of age group 31 to 40 years with mean age of 39.74 +/- 11.92. Surprisingly, the most common type of Perianal fistulain our study population was G IV fistula (26.2%) followed by Grade III (21.3%) and Grade II (21.3%) fistulas. The late presentation with G IV fistula in our study population highlights the social taboos precluding the individuals from seeking timely medical assistance and thereby signifies creating due medical awareness.

Keywords: MR Fistulogram, Classification and types of Peri anal fistula, social taboos in south Indian town population.