Included here is a discussion of the pathophysiological aspects and risks of laparoscopic staging (such as trocar metastases) on the basis of international experience.Laparoscopy in combination with laparoscopic ultrasonography is a new staging procedure for tumors of the abdomen. The treatment of several other tumor entities, such as pancreatic and gastric cancer, lymphoma, ovarian cancer, liver malignancies, is also improved by more accurate staging. Laparoscopic staging helps prevent unnecessary laparotomies, provides much less trauma to the patient, maximum information on tumor spread, and enables palliative procedures to be performed during the staging procedure. This book provides detailed guidelines on the aim and technique of laparoscopic staging and discusses the pathophysiological aspects and risks of laparoscopic staging (such as trocar metastases) on the basis of international experience.Basic Aspects.- Technical Aspects of Pneumoperitoneum and Gasless Laparoscopy.- Laparoscopy with Pneumoperitoneum.- Gas.- Gas Pressure.- Complications of Laparoscopy with Pneumoperitoneum.- Laparoscopic Surgery Without Pneumoperitoneum.- Intra-abdominal Retraction Systems.- Subcutaneous Retraction Systems.- References.- Equipment and Strategies of Staging Laparoscopy.- Historical Perspective.- Set-Up and Equipment.- Future Directions.- References.- Pathophysiological Aspects of the Pneumoperitoneum.- Historical Aspects.- Complications During Laparoscopic Procedures.- Changes in Hepatoportal Blood Flow.- Changes in Renal Blood Flow and Function.- Alterations of the Cardiopulmonary System.- Hemodynamic Changes to the Lower Limbs.- References.- Risk of Port Site M?tastases.- Literature Review.- International Survey.- Metastases of Nonapparent Gallbladder Cancer.- Metastases of Colorectal Cancer.- Metastases of Other Carcinomas.- Discussion.- References.- Results and Strategies of Clinical Applications: Gastrointestinal Tract.- Staging Laparoscopy for Esophageal Cancer.- Genlól