Tuberculous peritonitis is a specific inflammatory disease of the peritoneum, rare in developed countries, often in developing countries. Symptoms usually have a chronic character and appearance of ascites is often the initial symptom of the disease. Symptomatology may not be typical. It occurs most often anorexia, weight loss, abdominal pain and subfebrile temperature Presented 23-year-old patient, after elective surgery on the right inguinal hernia, when the changes in the peritoneum and omentum were observed and 2l of ascites were evacuated, was admitted to Hospital for emergency surgery, Clinical Centre of Serbia, Belgrade for further diagnostic and therapeutic treatment. The patient noted occasional mild abdominal pain, bloating, fatigue and general weakness. Chest radiography showed a small pleural effusion in the right and laminar athelectasis in the lower right lung field. On performed EHO and MSCT of the abdomen is visible easily enlarged liver, with a discrete dilation of intrahepatic bile ducts, gallbladder with calculuses. Portal and spleen vein dilated, enlarged spleen. Right subphrenic and interintestinally present clear liquid. Other findings in order. Exploratory laparotomy was perfomed. Histopathological examination, of the slices of the peritoneum, confirmed changes typical for tuberculous peritonitis.