Brain Tumors: An Overview of Symptoms, Diagnosis, and Treatment

Introduction

An abnormal growth of cells in the brain is called a brain tumor. Brain tumors may be malignant (cancerous) or benign (non-cancerous).

Suspicions of a brain tumor may first arise from abnormal behavior or other symptoms. Symptoms are typically investigated with a series of tests aimed at making a diagnosis. If a brain tumor is the diagnosis, further information about the cancer cells is necessary to determine the best possible approach to treatment. There are many types of brain tumors that differ based on which type of cells make up the tumor. Also, determining the extent of the cancer helps the doctor to understand the likelihood that the tumor will spread into other brain tissues, a characteristic which may also be referred to as the aggressiveness of the cancer.

14. Leukemia

Overview

Leukemia is a cancer of the blood cells. There are many different types of leukemia, depending upon which specific blood cells are affected. Each leukemia has different disease characteristics and therefore different treatment options. Several clinical diagnostic tests are utilized in order to determine the type and extent of leukemia. In order to better understand leukemia and its treatment, a basic understanding of normal blood cell production is useful.

Normal blood is made up of fluid called plasma and three main types of blood cells. Plasma is mainly water, but contains minerals, proteins and antibodies. The three major blood cell types are white cells, red cells and platelets. Each type of blood cell has a specific function. White blood cells, also called leukocytes, help the body fight infections and other diseases. Red blood cells, also called erythrocytes, make up half the blood’s total volume. They contain hemoglobin, which picks up oxygen from the lungs and carries it to the body’s organs. Platelets, or thrombocytes, help form blood clots to control bleeding.

Blood cells are produced inside the bones in a spongy space called the bone marrow. The process of blood cell formation is called hematopoiesis. All blood cells have a common origin called a stem cell. Stem cells develop into specific mature blood cells by a process