Sphere of influence. In the field of international relations, a sphere of influence (SOI) is a spatial region or concept division over which a state or organization has a level of cultural, economic, military, or political exclusivity, accommodating to the interests of powers outside the borders of the state that controls it.
Multiple myeloma is named for the clock face appearance of these cancer cells when seen under a microscope. They infiltrate virtually all of a patient's bone marrow. In x-ray images of multiple myeloma, it looks like holes have been punched out of the bone.
Multiple myeloma can cause soft spots in the bone called osteolytic lesions, which appear as holes on an X-ray. These osteolytic lesions are painful and can increase the risk of painful breaks or fractures. Myeloma can also cause nerve damage or pain when a tumor presses up against a nerve.