BACKGROUND: The diagnosis of acute abdomen in the emergency setting, still remains a challenging problem. In these cases timely diagnosis and management is of great importance, while the anesthetic risk is high. The combination of the risk of an open laparotomy and the relative high likelihood of negative findings when performed, creates the need for a better approach. The alternative actually exists since 1911 when Eruheim made the first gasless laparoscopy. The aim of this study is to put back into the spotlight, gasless laparoscopy in the differential diagnosis of acute abdomen and to underline the advantages of this simple, cheap and very useful technique, especially in patients that require prompt diagnosis and have relative or absolute contraindications to general anesthesia or pneumoperitoneum.METHODS: This study included 49 patients that were managed with gasless laparoscopy for the diagnosis of acute abdomen, from 2011 to 2013. Two techniques were used: the mechanical lift of the anterior abdominal wall and the LapVision device.RESULTS: From the 49 patients included in the study, 41 were diagnosed with gasless laparoscopy while in eight the results were uncertain or there wasn't any pathology involved. With both techniques used, sample of the intraperitoneal fluid or biopsy could be obtained.CONCLUSION: The gasless technique for laparoscopy is an extremely useful mean of diagnosis in emergency conditions, or for patients with contraindications to undergo laparoscopy by pneumoperitoneum. Requiring only local or regional anesthesia, this technique could easily find application in diagnosis and treatment, while avoiding unnecessary laparotomies. Hippokratia 2015, 19 (1): 69-72.