Hepatic veno-occlusive disease (HVOD) is a serious medical condition that affects the liver. This disease is characterized by the obstruction of the small veins in the liver, which can lead to liver failure and other complications. There are several other terms that are used to describe this condition, such as sinusoidal obstruction syndrome (SOS) and veno-occlusive disease (VOD). These terms describe the same condition, but may be used by different healthcare professionals. While the symptoms and treatments for HVOD may vary, early diagnosis and treatment are important for managing the disease and improving outcomes for patients. If you have concerns about HVOD or related conditions, speak with your doctor or healthcare provider.