Conditions such as arthritis, bone cancer, bone infection and bone trauma can cause dark spots to show during a bone scan, according to the Johns Hopkins Medicine Health Library. These spots typically occur in areas where cells rapidly multiply.Know More
Drugs.com defines bone scans as tests that look for abnormal bone cell metabolism. The test involves the injection of a tracer. According to WebMD, it may take between two to five hours for the tracer to bind to the bones. After the wait period, the patient is asked to drink up to six glasses of water to flush out excess tracer. The patient then lies down on a table where a large camera slowly scans the bones.
WebMD explains that a normal scan shows the tracer evenly distributed throughout the bones. Dark spots, also known as hot spots, show where the tracer collects in the bone. This occurs in areas that are healing or have abnormal growth patterns.
Bone scans are just one of many tools a physician uses to diagnose an illness. Though bone scans may show abnormalities, explains Mayo Clinic, they do not show what causes the problems. According to WebMD, a physician also considers the symptoms and results of other tests, such as X-rays, before making a diagnosis.Learn more about Cancer
Mayo Clinic defines a bone scan as a nuclear imaging test that is used to diagnose and monitor multiple types of bone disease. Doctors typically order bone scans if a patient has a bone injury or abnormality that can't be detected on a standard X-ray. The scans can also be used to determine if cancer that started in a different part of the body has spread to the bones.Full Answer >
According to HealthGuidance, smoking, hormonal imbalance, vitamin deficiency, iron build-up in the body, caffeinated beverages, hyper-pigmentation and allergic reaction can cause dark spots to appear on the lips. Sun exposure can also cause dark spots as UV rays cause spots of pigment, also called freckles, to appear on the skin. Dark spots may also be a sign of melanoma cancer.Full Answer >
During a bone scan, clothing and jewelry are removed, and a gown or sheet is placed to cover the patient, explains WebMD. An intravenous line is started, and a tracer is injected. This tracer is used to visualize the bones and is picked up by an imaging device.Full Answer >
Some of the risks of having a bone scan include rashes, severe allergic reactions and swelling, explains MedlinePlus. In addition, there is a very minimal risk of bleeding and infection at injection sites.Full Answer >