Tuberculous peritonitis is one of the extrapulmonary manifestations of tuberculosis. There are two types: wet (as in this case) and dry (characterized by multiple necrotic lymph nodes).

It has been challenging to differentiate radiologically between tuberculous peritonitis and another disease affecting the peritoneum.

CA-125, often used as an ovarian cancer marker, is also elevated in patients with tuberculosis, both pulmonary and extrapulmonary.

The most useful CT finding in the differentiation of tuberculous peritonitis and peritonitis carcinomatosis is the appearance of the parietal peritoneum. While smooth minimal thickening and significant enhancement in the peritoneum support tuberculous peritonitis, nodular implants, and irregular peritoneal thickening suggest the diagnosis of peritonitis carcinomatosis.