Question: What is (are) Childhood Hodgkin Lymphoma ?
Answer: Key Points - Childhood Hodgkin lymphoma is a disease in which malignant (cancer) cells form in the lymph system. - There are two types of childhood Hodgkin lymphoma. - Epstein-Barr virus infection increases the risk of childhood Hodgkin lymphoma. - Signs of childhood Hodgkin lymphoma include swollen lymph nodes, fever, night sweats, and weight loss. - Tests that examine the lymph system are used to detect (find) and diagnose childhood Hodgkin lymphoma. - Certain factors affect prognosis (chance of recovery) and treatment options. Childhood Hodgkin lymphoma is a disease in which malignant (cancer) cells form in the lymph system. Childhood Hodgkin lymphoma is a type of cancer that develops in the lymph system, which is part of the body's immune system. The immune system protects the body from foreign substances, infection, and diseases. The lymph system is made up of the following: - Lymph: Colorless, watery fluid that carries white blood cells called lymphocytes through the lymph system. Lymphocytes protect the body against infections and the growth of tumors. - Lymph vessels: A network of thin tubes that collect lymph from different parts of the body and return it to the bloodstream. - Lymph nodes: Small, bean-shaped structures that filter lymph and store white blood cells that help fight infection and disease. Lymph nodes are located along the network of lymph vessels found throughout the body. Clusters of lymph nodes are found in the neck, underarm, abdomen, pelvis, and groin. - Spleen: An organ that makes lymphocytes, filters the blood, stores blood cells, and destroys old blood cells. The spleen is on the left side of the abdomen near the stomach. - Thymus: An organ in which lymphocytes grow and multiply. The thymus is in the chest behind the breastbone. - Tonsils: Two small masses of lymph tissue at the back of the throat. The tonsils make lymphocytes. - Bone marrow: The soft, spongy tissue in the center of large bones. Bone marrow makes white blood cells, red blood cells, and platelets. Lymph tissue is also found in other parts of the body such as the stomach, thyroid gland, brain, and skin. There are two general types of lymphoma: Hodgkin lymphoma and non-Hodgkin lymphoma. (See the PDQ summary on Childhood Non-Hodgkin Lymphoma Treatment for more information.) Hodgkin lymphoma often occurs in adolescents 15 to 19 years of age. The treatment for children and adolescents is different than treatment for adults. (See the PDQ summary on Adult Hodgkin Lymphoma Treatment for more information.) There are two types of childhood Hodgkin lymphoma. The two types of childhood Hodgkin lymphoma are: - Classical Hodgkin lymphoma. - Nodular lymphocyte-predominant Hodgkin lymphoma. Classical Hodgkin lymphoma is divided into four subtypes, based on how the cancer cells look under a microscope: - Lymphocyte-rich classical Hodgkin lymphoma. - Nodular sclerosis Hodgkin lymphoma. - Mixed cellularity Hodgkin lymphoma. - Lymphocyte-depleted Hodgkin lymphoma.
Source: CancerGov

Question: How to diagnose Childhood Hodgkin Lymphoma ?
Answer: Tests that examine the lymph system are used to detect (find) and diagnose childhood Hodgkin lymphoma. The following tests and procedures may be used: - Physical exam and history : An exam of the body to check general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient's health habits and past illnesses and treatments will also be taken. - CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the neck, chest, abdomen, or pelvis, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography. - PET scan (positron emission tomography scan): A procedure to find malignant tumor cells in the body. A small amount of radioactive glucose (sugar) is injected into a vein. The PET scanner rotates around the body and makes a picture of where glucose is being used in the body. Malignant tumor cells show up brighter in the picture because they are more active and take up more glucose than normal cells do. Sometimes a PET scan and a CT scan are done at the same time. If there is any cancer, this increases the chance that it will be found. - Chest x-ray : An x-ray of the organs and bones inside the chest. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body. - Complete blood count (CBC): A procedure in which a sample of blood is drawn and checked for the following: - The number of red blood cells, white blood cells, and platelets. - The amount of hemoglobin (the protein that carries oxygen) in the red blood cells. - The portion of the blood sample made up of red blood cells. - Blood chemistry studies : A procedure in which a blood sample is checked to measure the amounts of certain substances released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease. - Sedimentation rate : A procedure in which a sample of blood is drawn and checked for the rate at which the red blood cells settle to the bottom of the test tube. The sedimentation rate is a measure of how much inflammation is in the body. A higher than normal sedimentation rate may be a sign of lymphoma. Also called erythrocyte sedimentation rate, sed rate, or ESR. - Lymph node biopsy : The removal of all or part of a lymph node. The lymph node may be removed during an image-guided CT scan or a thoracoscopy, mediastinoscopy, or laparoscopy. One of the following types of biopsies may be done: - Excisional biopsy : The removal of an entire lymph node. - Incisional biopsy : The removal of part of a lymph node. - Core biopsy : The removal of tissue from a lymph node using a wide needle. - Fine-needle aspiration (FNA) biopsy : The removal of tissue from a lymph node using a thin needle. A pathologist views the tissue under a microscope to look for cancer cells, especially Reed-Sternberg cells. Reed-Sternberg cells are common in classical Hodgkin lymphoma. The following test may be done on tissue that was removed: - Immunophenotyping : A laboratory test used to identify cells, based on the types of antigens or markers on the surface of the cell. This test is used to diagnose the specific type of lymphoma by comparing the cancer cells to normal cells of the immune system.
Source: CancerGov