Ramesh Kumar1, Rajeev Nayan Priyadarshi2, Utpal Anand3. 1. Associate Professor, Department of Gastroenterology, All India Institute of Medical Sciences, Patna, Bihar, India. 2. Additional Professor, Department of Radiodiagnosis, All India Institute of Medical Sciences, Patna, Bihar, India. 3. Associate Professor, Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Patna, Bihar, India.