Hemorrhagic diathesis caused by multiple myeloma in a three-month-old foal.

The research is about a three-month-old Quarter Horse foal diagnosed with multiple myeloma, a rare form of cancer, which led to various health problems such as weight loss, lung infection, and nosebleeds.

Research Subject and Diagnosis

• The subject of this study was a three-month-old foal from the Quarter Horse breed. The foal was presented with a chronic weight loss condition, a chronic lung infection called bronchopneumonia, and epistaxis, also known as nosebleeds.
• After a series of tests, the foal was diagnosed with multiple myeloma. Multiple myeloma is a subtype of plasma cell myeloma, a rare form of cancer that forms in a type of white blood cell called a plasma cell. Plasma cells help the body fight infections by producing substances that recognize and attack germs. In the case of this foal, between 80 and 90% of its bone marrow was made up of plasma cells, indicating a strong proliferation of cancer cells.

Associated Conditions

• In addition to the symptoms already mentioned, the foal presented with pancytopenia and thrombocytopenia. Pancytopenia refers to a health condition where the body has reduced levels of all types of blood cells (red blood cells, white blood cells, and platelets), which can lead to an increased risk of infection, anemia, and bleeding problems. On the other hand, thrombocytopenia is a medical condition where the blood has a lower than normal number of platelets — blood cells that help with clotting — leading to bleeding and bruising.
• Also, the foal had monoclonal beta-globulinemia, a condition marked by an excess of certain proteins (monoclonal proteins or M-proteins) in the blood. These proteins are produced by the abnormal plasma cells in the bone marrow, and their presence usually indicates multiple myeloma or a similar type of blood disorder.

Implication and Relevance

• The presence of these symptoms in a such a young foal indicates that, despite being uncommon, multiple myeloma can manifest itself in animals at a very young age. Therefore, veterinarians and horse breeders need to be aware of these conditions and consider them when dealing with young foals that exhibit related symptoms.