A 75-year-old woman is hospitalised for sepsis. The diagnosis of cholecystitis is made and an antibiotic therapy is debuted. The clinical worsening leads to realise an urgent cholecystectomy. A sepsis like shock persisted. The antibiotherapy was changed and a second abdominal look made. A severe lactic acidosis persisted since the cholecystectomy despite a continuous hemofiltration. The diagnosis of type B lactic acidosis secondary to malignancy was suspected. An osteomedullar biopsy revelled B-cell lymphoma EBV induced.