Post written by Yohei Koyama, MD, from the Department of Gastroenterology and Hepatology, Tokyo Medical University, Tokyo, Japan. Situs inversus totalis (SIT) is defined as the complete mirror-image transposition of the thoracic and abdominal viscera. It is a relatively rare congenital anomaly with an incidence of approximately 1 per 4,000 to 8,000 persons. Endoscopic submucosal …