Near-Fatal Gastrointestinal Hemorrhage in a Child with Medulloblastoma on High Dose Dexamethasone

Area of Science:

• Pediatric Oncology
• Gastroenterology
• Neurosurgery

Background:

• Posterior fossa tumors, such as medulloblastoma, are aggressive brain cancers often requiring intensive treatment.
• High-dose corticosteroids like dexamethasone are frequently used to manage brain edema associated with intracranial tumors.
• Stress ulcer prophylaxis is standard care for patients receiving high-dose steroids, especially those with critical illnesses.

Observation:

• A pediatric patient with a newly diagnosed posterior fossa medulloblastoma received high-dose dexamethasone post-surgery.
• Despite receiving famotidine for stress ulcer prophylaxis, the patient developed multiple gastrointestinal bleeds.
• A massive, life-threatening duodenal bleed occurred, necessitating emergency surgery due to erosion into the gastroduodenal artery.

Findings:

• The patient experienced a rare and severe gastrointestinal hemorrhage attributed to high-dose dexamethasone therapy.
• The duodenal ulceration and erosion occurred despite standard stress ulcer prophylaxis, indicating a potential failure of this regimen in specific contexts.
• This case underscores the significant gastrointestinal risks associated with high-dose dexamethasone in pediatric patients with posterior fossa pathology.

Implications:

• This case highlights a critical, albeit rare, complication of dexamethasone treatment in pediatric neuro-oncology.
• It suggests a potential need to re-evaluate or augment stress ulcer prophylaxis strategies in high-risk pediatric patients.
• Further research into the mechanisms linking intracranial pathology, dexamethasone, and severe gastrointestinal complications is warranted.