Tuberculous Peritonitis Diagnosed by Metagenomic Next-Generation Sequencing Progressing to Fatal Encapsulating Peritoneal Sclerosis in a Peritoneal Dialysis Patient: A Case Report.

A 40-year-old woman on peritoneal dialysis for 3 years presented with febrile peritonitis. Metagenomic next-generation sequencing (mNGS) confirmed Mycobacterium tuberculosis complex in ascitic fluid, leading to prompt anti-tuberculosis therapy. She initially improved but developed ultrafiltration failure 15 months later and transitioned to hemodialysis. At 18 months, she developed bowel obstruction, bloody ascites, and characteristic imaging and laparoscopic findings of encapsulating peritoneal sclerosis (EPS). Despite supportive care, she deteriorated and died 30 months after tuberculosis peritonitis diagnosis. This case highlights that mNGS enables rapid diagnosis of tuberculous peritonitis when conventional tests are inconclusive, and that tuberculosis peritonitis may serve as a potent inflammatory trigger for EPS even after peritoneal dialysis cessation. Early recognition and timely intervention may improve outcomes.