Published online by Cambridge University Press: 24 April 2026
1. Sinusoidal obstructive syndrome (SOS)/Veno-occlusive disease (VOD) is a potentially fatal complication of hematopoietic stem cell transplant (HSCT) and chemotherapy treatment that can cause multi-organ failure, including pulmonary and renal dysfunction.
2. Suspect SOS/VOD in patients with recent stem cell transplant or chemotherapy presenting with hepatomegaly, ascites, and weight gain.
3. SOS/VOD diagnostic criteria is separated into classic and late onset SOS/VOD, which involves the presence of hyperbilirubinemia plus two or more findings of ascites, weight gain, and right upper quadrant abdominal pain.
4. Management of fluid status is critical and should be started before diagnosis is confirmed
5. Defibrotide is potentially lifesaving. Unless SOS/VOD is mild, begin this mediation when more than two diagnostic criteria are present.
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