Peritoneal tuberculosis comprises 5% of all forms of tuberculosis in children. There are limited reports of peritoneal TB in children.

To determine the clinical, biochemical, radiologic, histologic, and microbiologic features and outcome of pediatric patients diagnosed with peritoneal tuberculosis.

Review of medical records from 2011-2020 of patients fulfilling diagnostic criteria of peritoneal TB. Patient was considered as bacteriologically-confirmed if with positive AFB smear, culture, or PCR on peritoneal or omental tissue; and clinically-diagnosed if with clinical findings AND presence of histologic and/or radiologic evidence of extra-pulmonary TB. Data was presented as mean (SD) or n (%), as appropriate.

Eighteen patients [Mean (SD) age: 14.27 (± 4.1) years old, 56% males] were included. All had disseminated TB with peritoneal involvement. One case was bacteriologically-confirmed (TB PCR positive omental tissue); 17 were clinically-diagnosed. Most common presentation was abdominal distention (83%) and abdominal pain (61%). Most common physical finding was abdominal distention (83%) and abdominal tenderness (44%). Seven patients (39%) had anemia, 11 (61%) had leukocytosis, and three (17%) had thrombocytosis. Thirteen (72%) had hypoalbuminemia. Ten (56%) were positive on AFB smear, TB culture, and PCR of various specimens. Fourteen of sixteen (88%) with abdominal CT scan had ascites and intrabdominal lymphadenopathy. Nine of 12 tissue samples from seven patients demonstrated chronic granulomatous inflammation. Seventeen were given quadruple anti-TB. Six also had surgery. Overall, 15 were discharge improved after mean of 4.2 weeks of hospital stay, while three died of sepsis. Eleven of the 15 were well one month after discharge.

Peritoneal TB presents with non-specific clinical and laboratory features. Radiologic and histologic findings increase the likelihood of diagnosis. The prognosis is favorable for patients who are diagnosed and treated with anti-TB drugs.