Pathologists play an important role in the management of patients with persistent symptoms, particularly those who are immunocompromised, have immunosuppressive diseases, or are being treated for malignancies. To refine the differential diagnosis and simplify patient management, it is important to be able to focus on the important characteristics of the biopsy material. This atlas meets these requirements in a simple and accessible way. It describes practical techniques for diagnosing gastrointestinal diseases and provides important criteria for distinguishing new-onset esophagitis from gastritis.

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