143 Introduction Enterobius vermicularis is the most common helmintic parasite known, affecting all members of society regardless of age, gender, and social status [1]. They typically reside in the caecum, appendix and distal ileum, where they adhere to the mucosa [2]. Although many infections are asymptomatic, perianal itching, especially at night, is the most common symptom [1]. However there are a lot of atypical presentations described in the literature, for example, infections of the kidneys [3] and infections of the female genital tract [4] as well as many other presentations. Typically the diagnosis rests upon applying cellophane or scotch tape to the perianal skin in the morning, removing it, and detecting eggs using the microscope [1, 5]. The worms can however be seen during endoscopy [6], and both the worm and its eggs can be found in histological specimens [5, 7]. Once diagnosed the infection is eradicated with two doses of Mebendzole two weeks apart as well as hygienic measures [8]. We here report a case of a man who presented with diarrhea. Inflammatory bowel disease was suspected and a colonoscopy showed ulcerated lesions suggestive of tubercular ulcersbut colonic biopsy revealed eggs of Enterobius vermicularis. Enterobius vermicularis has been reported to cause various manifestations but presenting as tubercular ulcer is rare. ABSTRACT Enterobius vermicular is a parasite can lead to inflammation and symptoms in rare cases however it can manifest as ulceration in colon which may mimic tubercular ulcer. A 40-year-oldman presented with pain abdomen. The pathologic findings confirmed the diagnosis of E. vermicularis in the colonic biopsy. It is important to be aware of this resemblance to avoid unnecessary surgical intervention and simple treatment measures which can cure the patient. KEYWORDS Enterobius vermicularis, Colon mimicking, tubercular ulcers Enterobius vermicularis in colon mimicking tubercular ulcers Tanushri Mukherjee*, P. Sanyal, S.DeySarkar and Atoshi Basu Department of Oncopathology, Command hospital Kolkata West Bengal, India *Corresponding author ISSN: 2347-3215 Volume 3 Number 2 (February-2015) pp. 143-146 www.ijcrar.com