Hone your clinical reasoning and diagnostic skills with a new series of case-based topic-specific studies. This compilation of 20 gastroenterology-related cases includes presenting clinical manifestations and a discussion of the broad range of possible diagnoses, with a reveal of the actual diagnosis at the end. Cases cover gastrointestinal tumors, masses, and large cysts; primary gynecologic pathology; foreign body; infections; nutritional, metabolic, and immune abnormalities; abuse and neglect; and genitourinary issues, appendicitis, and even peptic ulcer disease. Whether you're a physician-in-training, a pediatrician, a pediatric gastroenterologist, a surgeon, specialist, or clinician, you may not have the luxury to quickly refer to a center with specialists, subspecialists, and even sub-subspecialists, such as pediatric interventional endoscopists, which can impact referral decisions and take on a different degree of urgency, depending on the acuity of illness and available experti