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Non-neoplastic Lesions of the Appendix

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Surgical Pathology of the Gastrointestinal System

Abstract

The vermiform appendix is often regarded as a rudimentary or vestigial organ in human beings. This view has been challenged time and again, and contrary to earlier considerations, its role in immunological surveillance of the gut is now well understood. The histology of the appendix to some extent overlaps and probably represents a transition between the terminal ileum and colon. Nevertheless, the appendix have several unique features and specialized cells. The different layers of appendix include an innermost columnar-lined mucosa with enterocytes, specialized cells like goblet cells, entero-endocrine cells, and Paneth cells, surrounded by submucosa with an externally located muscularis externa and serosa. The large lymphoid follicles, often with prominent germinal centers and with unique immunophenotype and functions, may represent an embryological extension of the Peyer’s patches of the terminal ileum. This chapters covers the congenital malformations, different forms of appendicitis with related granulomatous and infectious etiologies, and also provides an immunological perspective of the appendix. This is followed by a brief account on some of the rare non infectious conditions.

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The authors agree to the fact that all biopsy procedures and surgical resections were performed after taking informed consent from respective patients as per the individual Institutional policies, which also includes consent for publishing the unidentified clinical images for publication or research purposes. The authors also declare no conflict of interest.

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Bandyopadhyay, A., Majumdar, K., Mishra, V. (2022). Non-neoplastic Lesions of the Appendix. In: Das, P., Majumdar, K., Datta Gupta, S. (eds) Surgical Pathology of the Gastrointestinal System. Springer, Singapore. https://doi.org/10.1007/978-981-16-6395-6_13

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