The Syndrome of Veno-occlusive Disease After Blood or Marrow Transplantation

Veno-occlusive disease of the liver (VOD) was originally described in patients who drank infusions made with plants containing pyrrolizidine alkaloids [1]. This disease was characterized, histologically, by a progressive and concentric non-thrombotic narrowing of the lumina of small intrahepatic veins. Later, VOD was related to other pathogens such as alcohol, contraceptives, toxic oil, liver radiation and several antineoplastic drugs [2-3]. The first case of veno-occlusive disease following bone marrow transplantation (BMT) was reported in 1979 [4]. Since then, BMT has proved to be the main cause of VOD which is one of the leading causes of morbidity and mortality after transplant [5-7]. Clinical manifestations of VOD are very characteristic (jaundice, painful hepatomegaly and fluid retention) but indistinguishable from those produced by other regime-related morphological changes on zone 3 of the liver acinus. For this reason, the term "syndrome of veno-occlusive disease of the liver" has been adopted to designate the clinical manifestations of conditioning regimen toxicity on this zone [8]. This review focuses on the present knowledge of VOD syndrome after BMT.