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.
Blood cells are formed in bone marrow. The white blood cells and the red blood cells are formed there. They are formed from the bone marrow stem cells. There are special cell lines to form myeloid cells and lymphoid cells. When the cells divide with out a control it is defined as cancer (blood cancer). The treatment may be chemo theraphy or bone marrow transplantation. Lymphoma is a cancer with lymphoid tissue. Mainly there are two types of lymphoma. Hodgkins lymphoma and non Hodgkinns lymphoma are commonly occurring lymphomas. Lymphocyte may be B or T in type. Lymphomas may present as enlarged lymph nodes.