The failure of the dams came as a big surprise. Johnstown had constructed an entire system designed to completely eliminate the flood risk. In addition, regular inspections had turned up no defects. Still, the dams were no match for the thunderstorm that stalled over the area on July 20.
Common types of blood cancer include: 1  Leukemia: Cancer that originates in blood-forming tissue. 2  Non-Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes, a type of white blood cell that helps the body fight infections. Non-Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes, a type of white blood cell that helps the body fight infections. 2  Hodgkin lymphoma: Cancer that develops in the lymphatic system from cells called lymphocytes.
Types Of Blood Diseases. There are many different blood diseases that are diagnosed and treated by hematologists. Some of these are benign (non-cancerous) and others are types of blood cancer. They can involve one or more of the three main types of blood cells (red blood cells, white blood cells, and platelets). They can also involve blood proteins involved in clotting. Not every blood disorder requires treatment.