Figure 4. Tuberculous peritonitis in a 38-year-old woman with abdominal distention for 1 week. CT scan shows a large amount of ascites with even peritoneal thickening (arrowhead) and diffuse omental infiltration (arrow) without associated lymphadenopathy. The initial impression was carcinomatosis. When the primary malignancy is unclear, the differential diagnosis should include tuberculous peritonitis, particularly in endemic areas. The final diagnosis was tuberculous peritonitis.