Definition: Anisoleucocytosis refers to an increase in white blood cell count with a decrease in red cell count due to cancer cells, often caused by leukemia or lymphoma. This condition can lead to severe pain and other symptoms related to decreased oxygen levels. Detailed definition: Anisoleucocytosis is characterized by an abnormal increase in the number of white blood cells compared to the number of red blood cells, typically seen in cancers such as leukemia or lymphoma, where cancerous cells break down healthy cells and produce more white blood cells than normal. The condition may result in symptoms like pain, weakness, weight loss, and difficulty breathing.