Background:

Clinical suspicion of peritoneal tuberculosis must coexist in all patients with abdominal pain of unknown cause; especially if accompanied by fever, ascites and abdominal distension.

Clinical case:

A 23- year-old patient with ascites and pleural effusion, pelvic mass, elevated Ca 125 (875 U/mL), symptoms suggestive of advanced ovarian cancer, laboratory and cabinet studies were conducted, finding that the tumor comes from the left ovary, a diagnostic laparotomy in which lesions suggestive of peritoneal tuberculosis were found, so biopsies were taken, upon finding the result of positive pathology, antituberculous treatment was given and then underwent surgical treatment again for persisting pelvic mass and acute abdomen data, finding a cystoadenofibroma, which when removed, eventually the patient recovered completely.

Conclusion:

Peritoneal tuberculosis is a rare and nonspecific disease, as is the manifestation of ovarian tumors, which is a diagnostic challenge.