Question: How to diagnose Osteosarcoma and Malignant Fibrous Histiocytoma of Bone ?
Answer: Imaging tests are used to detect (find) osteosarcoma and MFH. Imaging tests are done before the biopsy. 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 patients health habits and past illnesses and treatments will also be taken. - X-ray : An x-ray of the organs and bones inside the body. 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. - CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, 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. - MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is also called nuclear magnetic resonance imaging (NMRI). A biopsy is done to diagnose osteosarcoma. Cells and tissues are removed during a biopsy so they can be viewed under a microscope by a pathologist to check for signs of cancer. It is important that the biopsy be done by a surgeon who is an expert in treating cancer of the bone. It is best if that surgeon is also the one who removes the tumor. The biopsy and the surgery to remove the tumor are planned together. The way the biopsy is done affects which type of surgery can be done later. The type of biopsy that is done will be based on the size of the tumor and where it is in the body. There are two types of biopsy that may be used: - Core biopsy : The removal of tissue using a wide needle. - Incisional biopsy : The removal of part of a lump or a sample of tissue that doesn't look normal. The following test may be done on the tissue that is removed: - Light and electron microscopy : A laboratory test in which cells in a sample of tissue are viewed under regular and high-powered microscopes to look for certain changes in the cells.
Source: CancerGov

Question: What are the stages of Osteosarcoma and Malignant Fibrous Histiocytoma of Bone ?
Answer: Key Points - After osteosarcoma or malignant fibrous histiocytoma (MFH) has been diagnosed, tests are done to find out if cancer cells have spread to other parts of the body. - There are three ways that cancer spreads in the body. - Cancer may spread from where it began to other parts of the body. - Osteosarcoma and MFH are described as either localized or metastatic. After osteosarcoma or malignant fibrous histiocytoma (MFH) has been diagnosed, tests are done to find out if cancer cells have spread to other parts of the body. The process used to find out if cancer has spread to other parts of the body is called staging. For osteosarcoma and malignant fibrous histiocytoma (MFH), most patients are grouped according to whether cancer is found in only one part of the body or has spread. The following tests and procedures may be used: - X-ray : An x-ray of the organs, such as the chest, and bones inside the body. 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. X-rays will be taken of the chest and the area where the tumor formed. - CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the chest, 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. Pictures will be taken of the chest and the area where the tumor formed. - PET-CT scan : A procedure that combines the pictures from a positron emission tomography (PET) scan and a computed tomography (CT) scan. The PET and CT scans are done at the same time on the same machine. The pictures from both scans are combined to make a more detailed picture than either test would make by itself. A PET scan is 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. - MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is also called nuclear magnetic resonance imaging (NMRI). - Bone scan : A procedure to check if there are rapidly dividing cells, such as cancer cells, in the bone. A very small amount of radioactive material is injected into a vein and travels through the bloodstream. The radioactive material collects in the bones and is detected by a scanner. There are three ways that cancer spreads in the body. Cancer can spread through tissue, the lymph system, and the blood: - Tissue. The cancer spreads from where it began by growing into nearby areas. - Lymph system. The cancer spreads from where it began by getting into the lymph system. The cancer travels through the lymph vessels to other parts of the body. - Blood. The cancer spreads from where it began by getting into the blood. The cancer travels through the blood vessels to other parts of the body. Cancer may spread from where it began to other parts of the body. When cancer spreads to another part of the body, it is called metastasis. Cancer cells break away from where they began (the primary tumor) and travel through the lymph system or blood. - Lymph system. The cancer gets into the lymph system, travels through the lymph vessels, and forms a tumor (metastatic tumor) in another part of the body. - Blood. The cancer gets into the blood, travels through the blood vessels, and forms a tumor (metastatic tumor) in another part of the body. The metastatic tumor is the same type of cancer as the primary tumor. For example, if osteosarcoma spreads to the lung, the cancer cells in the lung are actually osteosarcoma cells. The disease is metastatic osteosarcoma, not lung cancer. Osteosarcoma and MFH are described as either localized or metastatic. - Localized osteosarcoma or MFH has not spread out of the bone where the cancer started. There may be one or more areas of cancer in the bone that can be removed during surgery. - Metastatic osteosarcoma or MFH has spread from the bone in which the cancer began to other parts of the body. The cancer most often spreads to the lungs. It may also spread to other bones.
Source: CancerGov