Hyperbaric oxygen therapy (HBOT) is gaining importance as a treatment modality for hemorrhagic cystitis (HC). At pressures of more than 1 atmospheric absolute, administering 100% oxygen initiates neovascularization and mucosal layer formation and reduces edema. HC is a pathological condition manifested with recurrent hematuria, urinary urgency, and suprapubic pain. HC can be caused by radiation exposure, chemotherapeutic drugs, and viral and bacterial infections. HC is a common sequela after stem cell transplant (SCT). Vascular injury and inflammation of bladder mucosa with the use of certain immunosuppressants and post-SCT is a known condition that leads to HC. HC is classified into two types based on the time of onset of the disease following chemotherapy/radiotherapy: Early and late onset of HC, which appears within 48–72 h and 2–3 months, respectively. HC is one of the approved indications for the administration of HBOT from the Undersea and Hyperbaric Medicine Society. There is scanty evidence of HBOT being effective in pediatric cases of hemorrhagic cystitis; however, the effectiveness of the therapy in a pediatric patient on opioid analgesic and active bladder irrigation was debatable. A case of a 6-year-old male child treated with a haploidentical SCT for X-linked adrenoleukodystrophy, was followed up with post-transplant cyclophosphamide. He developed intractable Grade III HC 2 weeks after transplant. The decision-making in assessing the fitness of this child to undergo therapy and the results achieved are discussed in detail in this paper.
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