The Gastrointestinal Pathology course is divided into non-neoplastic and neoplastic pathology of the tubular gastrointestinal tract. Special importance is placed on deciphering biopsies rather than resections, as biopsies are what direct the need for major operations and this, in many aspects, are samples that have the largest impact. In addition to discussion of biopsy interpretation of specific anatomic sites in the tubular gut, there are lectures reviewing issues that comprise the entire gastrointestinal tract, largely iatrogenic injuries and mesenchymal tumors.