Dr Prasenjit Das (MD, DNB, MNAMS, MNASc) is currently working as an Additional Professor of Pathology at the All India Institute of Medical Sciences (AIIMS), New Delhi, India. He did his pathology training from Postgraduate Institute of Medical Research and Education, Chandigarh, India and thereafter was trained in gastrointestinal pathology under several eminent mentors. His research areas are celiac disease, inflammatory bowel disease, intestinal tuberculosis, colorectal and pancreato-biliary carcinomas, non-alcoholic fatty liver diseases, vascular diseases of the liver, liver failures, and chronic liver diseases. He has more than 18 years of teaching and research experience and has published more than 197 peer-reviewed articles, including 109 original research articles to date. He also has many book chapters to his credit. He is a member of several national and international academic societies including the Rodger C. Haggitt Gastrointestinal Pathology Society,and the United States and Canadian Academy of Pathology (USCAP), USA, International Academy of Pathology-Indian Division, Indian Association of Pathologists and Microbiologist, and Indian Association of Gastroenterologists to name a few. He is serving as an associate editor of the Indian Journal of Pathologists & Microbiologists. He has received several awards including Prof N C Nayak Talented Young Pathologist Award (2012) from the Delhi chapter of IAPM, the Young Investigator Award from Indian Society of Gastroenterology, India (2015), ISG Abbott Presidential Poster Award (2015), Prof. KC Basu Mallick Award (2011) of IAPM, Research Excellence Award (2017) from AIIMS, New Delhi, Professor VR Khanolkar award (2018) and Professor Kunti Devi Mahrotra award (2019) from the Indian Association of Pathologists and Microbiologists. He was a core committee member for formulating the joint IAPM-ISG consensus practicing guidelines on handling and interpretation of small bowel biopsies inpatients with celiac disease in 2021. He is also an active member of the International Working Group on celiac disease.Professor Siddhartha Datta Gupta (MBBS, DCP, MD, FICPath, FIMSA, FAMS) was trained in clinical pathology from Bangalore Medical College and did his postgraduation from All India Institute of Medical Sciences (AIIMS), New Delhi, India. He is trained in liver pathology including liver transplant pathology as a British Council Study Fellow at the Royal Free Hospital & School of Medicine, London. Currently having superannuated, he served as Professor and one of the Deans at AIIMS, New Delhi. He also worked as a faculty member at St Johns Medical College, Bangalore, and as Professor and Head at the Asian Institute of Medical, Science, and Technology (AIMST) University, Malaysia. His areas of interest include liver and gastrointestinal pathology having worked in areas of acute and chronic hepatitis, chronic gastritis, celiac disease, inflammatory bowel disease, to name a few. With an experience of over 35 years as a teacher, he has mentored several generations of students. He has been involved in the development of the pathology curriculum for both undergraduate and postgraduates. He has been a member of international and national committees related to nomenclature of acute and subacute liver failure, celiac disease, hepatocellular carcinoma in India, and consensus statement of acute liver failure. He has served as an editorial board member of the Indian Journal of Gastroenterology, Indian Journal of Pathology and Microbiology, Hepatitis B Annual, Indian Journal of Laboratory Medicine and is an associate editor for the Indian Journal of Pathology and Microbiology. He has published over 340 papers in peer-reviewed national and international journals and has contributed chapters in textbooks and monographs. Dr Kaushik Majumdar (MD, DNB, MNAMS, DipRCPath) is currently working asSpecialist Pathology in Al Sabah Hospital, Kuwait. He has done MD in pathology from Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India. He has also earned the Diplomate of National Board (DNB) in pathology and Diplomate of Royal College of Pathology (DipRCPath), UK. He has around 80 publications in national and international indexed journals and one book chapter. He has delivered many invited talks and received awards in national and international conferences. He has around 15 years of experience in anatomic and clinical pathology, along with experience as faculty in undergraduate and postgraduate teaching and research. His principal areas of interest include gastrointestinal pathology, liver pathology, and pancreatico-biliary pathology. He is a reviewer of many prestigious national and international journals. He had also been a reviewer of postgraduate thesis and had been an examiner in pathology in prestigious institutes in India.

• Perspectives in gastrointestinal tract pathology.- Normal anatomical and histological basis for interpretation in gastrointestinal tract.- Endoscopic gastrointestinal biopsies and cytology samples: indications, endoscopic technique, collection, orientation, processing and handling of samples.- Grossing techniques of gastrointestinal tract specimens.- Diagnostic special stains, immunohistochemical markers and special techniques used in gastrointestinal tract pathology.- Pathology of diseases of esophagus.- Pathology of diseases of stomach.- Pathology of malabsorption syndrome.- Pathology of intestinal motility disorders.- Pathology of other infectious, inflammatory, autoimmune, immunodeficiency, vascular and drug induced diseases of small and large intestine.- Lesions of appendix.- Systemic diseases involving the gastrointestinal tract.- Diagnostic cytology of benign lesions of the gastrointestinal tract.- Pathology of pre-neoplastic lesions of gastrointestinaltract.- Pathology of epithelial lesions of gastrointestinal tract.- Pathology of lymphoid lesions of gastrointestinal tract.- Pathology of neuroendocrine lesions of gastrointestinal tract.- Pathology of mesenchymal lesions of gastrointestinal tract.- Neoplastic pathology of appendix.- Diagnostic cytology of malignant lesions of the gastrointestinal tract.- Molecular classifications of gastrointestinal tract tumors.- Setting up and management of a gastrointestinal tract pathology laboratory.

Dr Prasenjit Das (MD, DNB, MNAMS, MNASc) is currently working as an Additional Professor of Pathology at the All India Institute of Medical Sciences (AIIMS), New Delhi, India. He did his pathology training from Postgraduate Institute of Medical Research and Education, Chandigarh, India and thereafter was trained in gastrointestinal pathology under several eminent mentors. His research areas are celiac disease, inflammatory bowel disease, intestinal tuberculosis, colorectal and pancreato-biliary carcinomas, non-alcoholic fatty liver diseases, vascular diseases of the liver, liver failures, and chronic liver diseases. He has more than 18 years of teaching and research experience and has published more than 197 peer-reviewed articles, including 109 original research articles to date. He also has many book chapters to his credit. He is a member of several national and international academic societies including the Rodger C. Haggitt Gastrointestinal Pathology Society,and the United States and Canadian Academy of Pathology (USCAP), USA, International Academy of Pathology-Indian Division, Indian Association of Pathologists and Microbiologist, and Indian Association of Gastroenterologists to name a few. He is serving as an associate editor of the Indian Journal of Pathologists & Microbiologists. He has received several awards including Prof N C Nayak Talented Young Pathologist Award (2012) from the Delhi chapter of IAPM, the Young Investigator Award from Indian Society of Gastroenterology, India (2015), ISG Abbott Presidential Poster Award (2015), Prof. KC Basu Mallick Award (2011) of IAPM, Research Excellence Award (2017) from AIIMS, New Delhi, Professor VR Khanolkar award (2018) and Professor Kunti Devi Mahrotra award (2019) from the Indian Association of Pathologists and Microbiologists. He was a core committee member for formulating the joint IAPM-ISG consensus practicing guidelines on handling and interpretation of small bowel biopsies inpatients with celiac disease in 2021. He is also an active member of the International Working Group on celiac disease.Professor Siddhartha Datta Gupta (MBBS, DCP, MD, FICPath, FIMSA, FAMS) was trained in clinical pathology from Bangalore Medical College and did his postgraduation from All India Institute of Medical Sciences (AIIMS), New Delhi, India. He is trained in liver pathology including liver transplant pathology as a British Council Study Fellow at the Royal Free Hospital & School of Medicine, London. Currently having superannuated, he served as Professor and one of the Deans at AIIMS, New Delhi. He also worked as a faculty member at St Johns Medical College, Bangalore, and as Professor and Head at the Asian Institute of Medical, Science, and Technology (AIMST) University, Malaysia. His areas of interest include liver and gastrointestinal pathology having worked in areas of acute and chronic hepatitis, chronic gastritis, celiac disease, inflammatory bowel disease, to name a few. With an experience of over 35 years as a teacher, he has mentored several generations of students. He has been involved in the development of the pathology curriculum for both undergraduate and postgraduates. He has been a member of international and national committees related to nomenclature of acute and subacute liver failure, celiac disease, hepatocellular carcinoma in India, and consensus statement of acute liver failure. He has served as an editorial board member of the Indian Journal of Gastroenterology, Indian Journal of Pathology and Microbiology, Hepatitis B Annual, Indian Journal of Laboratory Medicine and is an associate editor for the Indian Journal of Pathology and Microbiology. He has published over 340 papers in peer-reviewed national and international journals and has contributed chapters in textbooks and monographs. Dr Kaushik Majumdar (MD, DNB, MNAMS, DipRCPath) is currently working asSpecialist Pathology in Al Sabah Hospital, Kuwait. He has done MD in pathology from Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India. He has also earned the Diplomate of National Board (DNB) in pathology and Diplomate of Royal College of Pathology (DipRCPath), UK. He has around 80 publications in national and international indexed journals and one book chapter. He has delivered many invited talks and received awards in national and international conferences. He has around 15 years of experience in anatomic and clinical pathology, along with experience as faculty in undergraduate and postgraduate teaching and research. His principal areas of interest include gastrointestinal pathology, liver pathology, and pancreatico-biliary pathology. He is a reviewer of many prestigious national and international journals. He had also been a reviewer of postgraduate thesis and had been an examiner in pathology in prestigious institutes in India.

• Perspectives in gastrointestinal tract pathology.- Normal anatomical and histological basis for interpretation in gastrointestinal tract.- Endoscopic gastrointestinal biopsies and cytology samples: indications, endoscopic technique, collection, orientation, processing and handling of samples.- Grossing techniques of gastrointestinal tract specimens.- Diagnostic special stains, immunohistochemical markers and special techniques used in gastrointestinal tract pathology.- Pathology of diseases of esophagus.- Pathology of diseases of stomach.- Pathology of malabsorption syndrome.- Pathology of intestinal motility disorders.- Pathology of other infectious, inflammatory, autoimmune, immunodeficiency, vascular and drug induced diseases of small and large intestine.- Lesions of appendix.- Systemic diseases involving the gastrointestinal tract.- Diagnostic cytology of benign lesions of the gastrointestinal tract.- Pathology of pre-neoplastic lesions of gastrointestinaltract.- Pathology of epithelial lesions of gastrointestinal tract.- Pathology of lymphoid lesions of gastrointestinal tract.- Pathology of neuroendocrine lesions of gastrointestinal tract.- Pathology of mesenchymal lesions of gastrointestinal tract.- Neoplastic pathology of appendix.- Diagnostic cytology of malignant lesions of the gastrointestinal tract.- Molecular classifications of gastrointestinal tract tumors.- Setting up and management of a gastrointestinal tract pathology laboratory.

Dr Prasenjit Das (MD, DNB, MNAMS, MNASc) is currently working as an Additional Professor of Pathology at the All India Institute of Medical Sciences (AIIMS), New Delhi, India. He did his pathology training from Postgraduate Institute of Medical Research and Education, Chandigarh, India and thereafter was trained in gastrointestinal pathology under several eminent mentors. His research areas are celiac disease, inflammatory bowel disease, intestinal tuberculosis, colorectal and pancreato-biliary carcinomas, non-alcoholic fatty liver diseases, vascular diseases of the liver, liver failures, and chronic liver diseases. He has more than 18 years of teaching and research experience and has published more than 197 peer-reviewed articles, including 109 original research articles to date. He also has many book chapters to his credit. He is a member of several national and international academic societies including the Rodger C. Haggitt Gastrointestinal Pathology Society,and the United States and Canadian Academy of Pathology (USCAP), USA, International Academy of Pathology-Indian Division, Indian Association of Pathologists and Microbiologist, and Indian Association of Gastroenterologists to name a few. He is serving as an associate editor of the Indian Journal of Pathologists & Microbiologists. He has received several awards including Prof N C Nayak Talented Young Pathologist Award (2012) from the Delhi chapter of IAPM, the Young Investigator Award from Indian Society of Gastroenterology, India (2015), ISG Abbott Presidential Poster Award (2015), Prof. KC Basu Mallick Award (2011) of IAPM, Research Excellence Award (2017) from AIIMS, New Delhi, Professor VR Khanolkar award (2018) and Professor Kunti Devi Mahrotra award (2019) from the Indian Association of Pathologists and Microbiologists. He was a core committee member for formulating the joint IAPM-ISG consensus practicing guidelines on handling and interpretation of small bowel biopsies inpatients with celiac disease in 2021. He is also an active member of the International Working Group on celiac disease.Professor Siddhartha Datta Gupta (MBBS, DCP, MD, FICPath, FIMSA, FAMS) was trained in clinical pathology from Bangalore Medical College and did his postgraduation from All India Institute of Medical Sciences (AIIMS), New Delhi, India. He is trained in liver pathology including liver transplant pathology as a British Council Study Fellow at the Royal Free Hospital & School of Medicine, London. Currently having superannuated, he served as Professor and one of the Deans at AIIMS, New Delhi. He also worked as a faculty member at St Johns Medical College, Bangalore, and as Professor and Head at the Asian Institute of Medical, Science, and Technology (AIMST) University, Malaysia. His areas of interest include liver and gastrointestinal pathology having worked in areas of acute and chronic hepatitis, chronic gastritis, celiac disease, inflammatory bowel disease, to name a few. With an experience of over 35 years as a teacher, he has mentored several generations of students. He has been involved in the development of the pathology curriculum for both undergraduate and postgraduates. He has been a member of international and national committees related to nomenclature of acute and subacute liver failure, celiac disease, hepatocellular carcinoma in India, and consensus statement of acute liver failure. He has served as an editorial board member of the Indian Journal of Gastroenterology, Indian Journal of Pathology and Microbiology, Hepatitis B Annual, Indian Journal of Laboratory Medicine and is an associate editor for the Indian Journal of Pathology and Microbiology. He has published over 340 papers in peer-reviewed national and international journals and has contributed chapters in textbooks and monographs. Dr Kaushik Majumdar (MD, DNB, MNAMS, DipRCPath) is currently working asSpecialist Pathology in Al Sabah Hospital, Kuwait. He has done MD in pathology from Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India. He has also earned the Diplomate of National Board (DNB) in pathology and Diplomate of Royal College of Pathology (DipRCPath), UK. He has around 80 publications in national and international indexed journals and one book chapter. He has delivered many invited talks and received awards in national and international conferences. He has around 15 years of experience in anatomic and clinical pathology, along with experience as faculty in undergraduate and postgraduate teaching and research. His principal areas of interest include gastrointestinal pathology, liver pathology, and pancreatico-biliary pathology. He is a reviewer of many prestigious national and international journals. He had also been a reviewer of postgraduate thesis and had been an examiner in pathology in prestigious institutes in India.

• Perspectives in gastrointestinal tract pathology.- Normal anatomical and histological basis for interpretation in gastrointestinal tract.- Endoscopic gastrointestinal biopsies and cytology samples: indications, endoscopic technique, collection, orientation, processing and handling of samples.- Grossing techniques of gastrointestinal tract specimens.- Diagnostic special stains, immunohistochemical markers and special techniques used in gastrointestinal tract pathology.- Pathology of diseases of esophagus.- Pathology of diseases of stomach.- Pathology of malabsorption syndrome.- Pathology of intestinal motility disorders.- Pathology of other infectious, inflammatory, autoimmune, immunodeficiency, vascular and drug induced diseases of small and large intestine.- Lesions of appendix.- Systemic diseases involving the gastrointestinal tract.- Diagnostic cytology of benign lesions of the gastrointestinal tract.- Pathology of pre-neoplastic lesions of gastrointestinaltract.- Pathology of epithelial lesions of gastrointestinal tract.- Pathology of lymphoid lesions of gastrointestinal tract.- Pathology of neuroendocrine lesions of gastrointestinal tract.- Pathology of mesenchymal lesions of gastrointestinal tract.- Neoplastic pathology of appendix.- Diagnostic cytology of malignant lesions of the gastrointestinal tract.- Molecular classifications of gastrointestinal tract tumors.- Setting up and management of a gastrointestinal tract pathology laboratory.