Pseudo tumoral peritoneal tuberculosis is a rare clinical form witch clinical and para clinical aspects can mimic advanced ovarian cancer leading to unjustified radical surgery, with high risk of morbidities, often in a young woman. We report a new case of pseudo tumoral peritoneal tuberculosis in a girl of 21 years old in which diagnosis of ovarian cancer with ascitis and peritoneal carcinomatosis was suspected clinically, radiologically and biologically by rising CA125. Exploratory laparotomy with extemporaneous histological examination has confirmed tuberculosis diagnosis.