Abnormal proliferation of white blood cells in the spinal cord, spleen and lymph nodes.
The onset of the disease is often brutal. In a few weeks, the child becomes very pale, is very tired, has fever. Other signs may appear: haemorrhages (digestive, nose, retina), swollen glands, abdominal or joint pain.
The blood count (NFS) shows abnormalities in numbers and a significant decrease in red blood cells and platelets. The treatment is essentially based on chemotherapy.