The genus Aesculus comprises 13-19 species of woody Trees and Shrubs native to the temperate northern hemisphere (with 6 species native to North America and 7-13 species native to Eurasia). There are also several hybrids.
Lymphoma is a form of cancer that affects the immune system-specifically, it is a cancer of immune cells called lymphocytes, a type of white blood cell. There are two broad types of lymphoma and many subtypes. The two types of lymphoma are described as: Hodgkin's or non-Hodgkin's.
Lymphomas are tumors made up of lymph cells (lymph is a fluid that flows through all the tissues of the human body and plays an important role in cleaning out bacteria and other foreign matter). Metastic tumors are brain tumors that have originated elsewhere in body and have metastasized to the brain.