Hepatic microvascular dysplasia
Encyclopedia
Hepatic microvascular dysplasia (HMD or MVD) or Portal Atresia is a disorder where mixing of venous blood
and arterial blood
in the liver
occurs at the microscopic
level. It occurs most commonly in certain dog breeds such as the Cairn
and Yorkshire terrier
s although any dog breed may be at risk.
Venous blood
Venous blood is deoxygenated blood in the circulatory system. It runs in the systemic veins from the organs to the heart. Deoxygenated blood is then pumped by the heart to lungs via the pulmonary arteries, one of the few arteries in the body that carries deoxygenated blood .Venous blood is...
and arterial blood
Artery
Arteries are blood vessels that carry blood away from the heart. This blood is normally oxygenated, exceptions made for the pulmonary and umbilical arteries....
in the liver
Liver
The liver is a vital organ present in vertebrates and some other animals. It has a wide range of functions, including detoxification, protein synthesis, and production of biochemicals necessary for digestion...
occurs at the microscopic
Microscopic
The microscopic scale is the scale of size or length used to describe objects smaller than those that can easily be seen by the naked eye and which require a lens or microscope to see them clearly.-History:...
level. It occurs most commonly in certain dog breeds such as the Cairn
Cairn Terrier
The Cairn Terrier is the oldest of the terrier breeds, originating in the Scottish Highlands and recognized as one of Scotland's earliest working dogs...
and Yorkshire terrier
Yorkshire Terrier
The Yorkshire Terrier is a small dog breed of terrier type, developed in the 19th century in the county of Yorkshire, England to catch rats in clothing mills. The defining features of the breed are its size, to , and its silky blue and tan coat...
s although any dog breed may be at risk.